Whenever you hear any rightwing asshat say that MLK would be a conservative, remind them about MLK's Poor People's Campaign and the Memphis Garbage Men Strike:
"During a heavy rainstorm in Memphis on February 1, 1968, two black sanitation workers had been crushed to death when the compactor mechanism of the trash truck was accidentally triggered. On the same day in a separate incident also related to the inclement weather, 22 black sewer workers had been sent home without pay while their white supervisors were retained for the day with pay. About two weeks later, on February 12, more than 1,100 of a possible 1,300 black sanitation workers began a strike for job safety, better wages and benefits, and union recognition. Mayor Henry Loeb, unsympathetic to most of the workers' demands, was especially opposed to the union. Black and white civic groups in Memphis tried to resolve the conflict, but the mayor held fast to his position.
As the strike lengthened, support for the strikers within the black community of Memphis grew. Organizations such as COME (Community on the Move for Equality) established food and clothing banks in churches, took up collections for strikers to meet rent and mortgages, and recruited marchers for frequent demonstrations. King's participation in forming a city-wide boycott to support the striking workers was invited by the Reverend James Lawson, pastor of the Centenary Methodist Church in Memphis and an adviser to the strikers. Lawson was a seasoned veteran of the civil rights movement and an experienced trainer of activists in the philosophy and methods of nonviolent resistance.
At that time King was involved in planning with other civil rights workers the Poor People's Campaign for economic opportunity and equality. He was also zigzagging by airplane through the eastern United States meeting speaking engagements and attending important social events as head of the Southern Christian Leadership Conference (SCLC).
Nevertheless, King agreed to lend his support to the sanitation workers, spoke at a rally in Memphis March 18, and promised to lead the large march and work stoppage planned for later in the month.
Unfortunately the demonstration on March 28 turned sour when a group of rowdy students at the tail end of the long parade of demonstrators used the signs they carried to break windows of businesses. Looting ensued. The march was halted, the demonstrators dispersed, and King was safely escorted from the scene. About 60 people had been injured, and one young man, a looter, was killed. This episode prompted the city of Memphis to bring a formal complaint in the District Court against King, Hosea Williams, James Bevel, James Orange, Ralph Abernathy, and Bernard Lee, King's associates in the Southern Christian Leadership Conference (SCLC).
The outbreak of violence deeply distressed King. In the next few days he and fellow SCLC leaders negotiated with the disagreeing factions in Memphis. When assured of their unity and commitment to nonviolence, King came back for another march, at first scheduled for April 5. In the meantime, U.S. District Court Judge Bailey Brown granted the city of Memphis a temporary restraining order against King and his associates. But the SCLC's planning and training for a peaceful demonstration had intensified. Lawson and Andrew Young, representing the SCLC, met with the judge April 4 and worked out a broad agreement for the march to proceed April 8. The details of the agreement would be put into place the next day, April 5.
This was the message that Young conveyed to King as they were getting ready to go out to dinner. Moments later, on that evening of April 4, 1968, as King stepped out of his motel room to join his colleagues for dinner, he was assassinated. "
http://www.archives.gov/education/lessons/memphis-v-mlk/