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Today Rev. Martin Luther King Jr. is viewed as something of an American saint. His birthday is a national holiday. His name adorns schools and street signs. Americans from across the political spectrum invoke King's name to justify their beliefs and actions, as President Barack Obama will no doubt do in his second Inaugural speech and as gun fanatic Larry Ward recently did in outrageously claiming that King would have opposed proposals to restrict access to guns.

So it is easy to forget that  in his day, in his own country, King was considered a dangerous troublemaker. He was harassed by the FBI and vilified in the media.

In fact, King was a radical. He believed that America needed a "radical redistribution of economic and political power." He challenged America's class system and its racial caste system.  He was a strong ally of the nation's labor union movement.  He was assassinated in April 1968 in Memphis, where he had gone to support a sanitation workers' strike.  He opposed U.S. militarism and imperialism, especially the country's misadventure in Vietnam.

In his critique of American society and his strategy for changing it,  King pushed the country toward more democracy and social justice. 

If  he were alive today, he would certainly be standing with Walmart employees and other workers fighting for a living wage and the right to unionize. He would be in the forefront of the battle for strong gun controls and to thwart the influence of the National Rifle Association. He would be calling for dramatic cuts in the military budget in order to reinvest public dollars in jobs, education, and health care.  He would surely be marching with immigrants and their allies in support of the Dream Act and comprehensive reform. Like most Americans in his day, King was homophobic, even though one of his closest advisors, Bayard Rustin, was gay. But today King would undoubtedly stand with advocates of LGBT rights and same-sex marriage.

Indeed, King's views evolved over time. He entered the public stage with some hesitation, reluctantly becoming the spokesperson for the Montgomery bus boycott in 1955 at the age of 26.  King began his activism in Montgomery as a crusader against the nation's racial caste system, but the struggle for civil rights radicalized him into a fighter for broader economic and social justice and peace. Still, in reviewing King's life, we can see that the seeds of his later radicalism were planted early. 

King was born in Atlanta, Georgia in 1929, the son of a prominent black minister. Despite growing up in a solidly middle-class family, King saw the widespread human suffering caused by the Depression, particularly in the black community. In 1950, while in graduate school, he wrote an essay describing the "anti-capitalistic feelings" he experienced as a result of seeing unemployed people standing in breadlines.

During King's first year at Morehouse College, civil rights and labor activist A. Philip Randolph spoke on campus. Randolph predicted that the near future would witness a global struggle that would end white supremacy and capitalism. He urged the students to link up with "the people in the shacks and the hovels," who, although "poor in property," were "rich in spirit."

After graduating from Morehouse in 1948, King studied theology at Crozer Theological Seminary in Pennsylvania (where he read both Mohandas Gandhi and Karl Marx), planning to follow in his father's footsteps and join the ministry. In 1955 he earned his doctorate from Boston University, where he studied the works of Reinhold Niebuhr, the influential liberal theologian. While in Boston, he told his girlfriend (and future wife), Coretta Scott, that "a society based on making all the money you can and ignoring people's needs is wrong."

When King moved to Montgomery to take his first pulpit at the Dexter Avenue Baptist Church, he was full of ideas but had no practical experience in politics or activism. But history sneaked up on him. On Thursday, December 1, 1955, Rosa Parks, a seamstress and veteran activist with the National Association for the Advancement of Colored People (NAACP), decided to resist the city's segregation law by refusing to move to the back of the bus on her way home from work. She was arrested. Two other long-term activists -- E. D. Nixon (leader of the NAACP and of the Brotherhood of Sleeping Car Porters) and Jo Ann Robinson (a professor at the all-black Alabama State College and a leader of Montgomery's Women's Political Council) -- determined that Parks' arrest was a ripe opportunity for a one-day boycott of the much-despised segregated bus system. Nixon and Robinson asked black ministers to use their Sunday sermons to spread the word. Some refused, but many others, including King, agreed.

The boycott was very effective. Most black residents stayed off the buses. Within days, the boycott leaders formed a new group, the Montgomery Improvement Association (MIA). At Nixon's urging, they elected a hesitant King as president, in large part because he was new in town and not embroiled in the competition for congregants and visibility among black ministers. He was also well educated and already a brilliant orator, and thus would be a good public face for the protest movement. The ministers differed over whether to call off the boycott after one day but agreed to put the question up to a vote at a mass meeting.

That night, 7,000 blacks crowded into (and stood outside) the Holt Street Baptist Church. Inspired by King's words --"There comes a time when people get tired of being trampled over by the iron feet of oppression"-- they voted unanimously to continue the boycott. It lasted for 381 days and resulted in the desegregation of the city's buses. During that time, King honed his leadership skills, aided by advice from two veteran pacifist organizers, Bayard Rustin and Rev. Glenn Smiley, who had been sent to Montgomery by the pacifist group, Fellowship of Reconciliation. During the boycott, King was arrested, his home was bombed, and he was subjected to personal abuse. But -- with the assistance of the new medium of television -- he emerged as a national figure.

In 1957 King launched the Southern Christian Leadership Conference (SCLC) to help spread the civil rights crusade to other cities. He helped lead local campaigns in different cities, including Selma and Birmingham, Alabama, where thousands marched to demand an end to segregation in defiance of court injunctions forbidding any protests. While participating in these protests, King also sought to keep the fractious civil rights movement together, despite the rivalries among the NAACP, the Urban League, the Student Nonviolent Coordinating Committee (SNCC), the Congress of Racial Equality (CORE), and SCLC. Between 1957 and 1968 King traveled over six million miles, spoke over 2,500 times, and was arrested at least 20 times, always preaching the gospel of nonviolence. King attended workshops at the Highlander Folk School in Tennessee, which connected him to a network of radicals, pacifists, and union activists from around the country whose ideas helped widen his political horizons.

It is often forgotten that the August 1963 protest rally at the Lincoln Memorial, where King delivered his famous  "I Have a Dream" speech, was called the March on Washington for Jobs and Freedom. King was proud of the civil rights movement's success in winning the passage of the Civil Rights Act in 1964 and the Voting Rights Act the following year. But he realized that neither law did much to provide better jobs or housing for the masses of black poor in either the urban cities or the rural South. "What good is having the right to sit at a lunch counter," he asked, "if you can't afford to buy a hamburger?"

King had hoped that the bus boycott, sit-ins, and other forms of civil disobedience would stir white southern moderates, led by his fellow clergy, to see the immorality of segregation and racism. His famous "Letter from a Birmingham Jail," written in 1963, outlines King's strategy of using nonviolent civil disobedience to force a response from the southern white establishment and to generate sympathy and support among white liberals and moderates. "The purpose of our direct-action program is to create a situation so crisis-packed that it will inevitably open the door to negotiation," he wrote, and added, "We know through painful experience that freedom is never voluntarily given by the oppressor; it must be demanded by the oppressed."

King eventually realized that many white Americans had at least a psychological stake in perpetuating racism. He began to recognize that racial segregation was devised not only to oppress African Americans but also to keep working-class whites from challenging their own oppression by letting them feel superior to blacks. "The Southern aristocracy took the world and gave the poor white man Jim Crow," King said from the Capitol steps in Montgomery, following the 1965 march from Selma. "And when his wrinkled stomach cried out for the food that his empty pockets could not provide, he ate Jim Crow, a psychological bird that told him that no matter how bad off he was, at least he was a white man, better than a black man."

When King launched a civil rights campaign in Chicago in 1965, he was shocked by the hatred and violence expressed by working-class whites as he and his followers marched through the streets of segregated neighborhoods in Chicago and its suburbs. He saw that the problem in Chicago's ghetto was not legal segregation but "economic exploitation" -- slum housing, overpriced food, and low-wage jobs -- "because someone profits from its existence."

These experiences led King to develop a more radical outlook. King supported President Lyndon B. Johnson's declaration of the War on Poverty in 1964, but, like his friend and ally Walter Reuther, the president of the United Auto Workers,  King thought that it did not go nearly far enough. As early as October 1964, he called for a "gigantic Marshall Plan" for the poor -- black and white. Two months later, accepting the Nobel Peace Prize in Oslo, he observed that the United States could learn much from Scandinavian "democratic socialism." He began talking openly about the need to confront "class issues," which he described as "the gulf between the haves and the have nots."

In 1966 King confided to his staff:

“You can't talk about solving the economic problem of the Negro without talking about billions of dollars. You can't talk about ending the slums without first saying profit must be taken out of slums. You're really tampering and getting on dangerous ground because you are messing with folk then. You are messing with captains of industry. Now this means that we are treading in difficult water, because it really means that we are saying that something is wrong with capitalism. There must be a better distribution of wealth and maybe America must move toward a democratic socialism."

Given this view, King was dismayed when Malcolm X, SNCC's Stokely Carmichael, and others began advocating "black power," which he warned would alienate white allies and undermine a genuine interracial movement for economic justice.

King became increasingly committed to building bridges between the civil rights and labor movements. Invited to address the AFL-CIO's annual convention in 1961, King observed, "The labor movement did not diminish the strength of the nation but enlarged it. By raising the living standards of millions, labor miraculously created a market for industry and lifted the whole nation to undreamed of levels of production. Those who today attack labor forget these simple truths, but history remembers them." In a 1961 speech to the Negro American Labor Council, King proclaimed, "Call it democracy, or call it democratic socialism, but there must be a better distribution of wealth within this country for all God's children." Speaking to a meeting of Teamsters union shop stewards in 1967, King said, "Negroes are not the only poor in the nation. There are nearly twice as many white poor as Negro, and therefore the struggle against poverty is not involved solely with color or racial discrimination but with elementary economic justice."

King's growing critique of capitalism coincided with his views about American imperialism. By 1965 he had turned against the Vietnam War, viewing it as an economic as well as a moral tragedy. But he was initially reluctant to speak out against the war. He understood that his fragile working alliance with LBJ would be undone if he challenged the president's leadership on the war. Although some of his close advisers tried to discourage him, he nevertheless made the break in April 1967, in a bold and prophetic speech at the Riverside Church in New York City, entitled "Beyond Vietnam--A Time to Break Silence." King called America the "greatest purveyor of violence in the world today" and linked the struggle for social justice with the struggle against militarism. King argued that Vietnam was stealing precious resources from domestic programs and that the Vietnam War was "an enemy of the poor." In his last book, Where Do We Go from Here: Chaos or Community? (1967), King wrote, "The bombs in Vietnam explode at home; they destroy the hopes and possibilities for a decent America."

In early 1968, King told journalist David Halberstam, "For years I labored with the idea of reforming the existing institutions of society, a little change here, a little change there. Now I feel quite differently. I think you've got to have a reconstruction of the entire society, a revolution of values."

King kept trying to build a broad movement for economic justice that went beyond civil rights. In January 1968 he announced plans for a Poor People's Campaign, a series of protests to be led by an interracial coalition of poor people and their allies among the middle-class liberals, unions, religious organizations, and other progressive groups, to pressure the White House and Congress to expand the War on Poverty. At King's request, socialist activist Michael Harrington (author of The Other America, which helped inspire Presidents Kennedy and Johnson to declare a war on poverty) drafted a Poor People's Manifesto that outlined the campaign's goals. In April King was in Memphis, Tennessee, to help lend support to striking African American garbage workers and to gain recognition for their union. There he was assassinated at age 39 on April 4, a few months before the first protest action of the Poor People's Campaign in Washington, DC.

President Johnson utilized this national tragedy to urge Congress to quickly enact the Fair Housing Act, legislation to ban racial discrimination in housing that King had strongly supported for two years. He signed the bill a week after King's assassination.

The campaign for a federal holiday in King's honor, spearheaded by Detroit Congressman John Conyers, began soon after his murder, but it did not come up for a vote in Congress until 1979, when it fell five votes short of the number needed for passage. In 1981, with the help of singer Stevie Wonder and other celebrities, supporters collected six million signatures on a petition to Congress on behalf of a King holiday.  Congress finally passed legislation enacting the holiday in 1983, fifteen years after King's death. But even then, 90 members of the House (including then-Congressmen John McCain of Arizona and Richard Shelby of Alabama, both now in the Senate) voted against it. Senator Jesse Helms, a North Carolina Republican, led an unsuccessful effort -- supported by 21 other senators, including current Senator Charles Grassley (R-Iowa) --  to block its passage in the Senate.

The holiday was first observed on January 20, 1986. In 1987 Arizona governor Evan Mecham rescinded King Day as his first act in office, setting off a national boycott of the state. Some states (including New Hampshire, which called it "Civil Rights Day" from 1991 to 1999) insisted on calling the holiday by other names.   In 2000 South Carolina became the last state to make King Day a paid holiday for all state employees.

In his final speech in Memphis the night before he was killed, King told the crowd about a bomb threat on his plane from Atlanta that morning, saying he knew that his life was constantly in danger because of his political activism.

"I would like to live a long life," he said. "Longevity has its place. But I'm not concerned about that now. I just want to do God's will. And he's allowed me to go up to the mountain, and I've looked over, and I've seen the promised land. I may not get there with you. But I want you to know tonight that we as a people will get to the promised land."

We haven't gotten there yet. But Dr. King is still with us in spirit. The best way to honor his memory is to continue the struggle for human dignity, workers' rights, racial equality, peace, and social justice.