Selma voting rights movement and "Bloody Sunday", 1965
Acting on James Bevel's call for a march from Selma to Montgomery, King, Bevel, and the SCLC, in partial collaboration with SNCC, attempted to organize the march to the state's capital. The first attempt to march on March 7, 1965, was aborted because of mob and police violence against the demonstrators. This day has become known as Bloody Sunday and was a major turning point in the effort to gain public support for the civil rights movement. It was the clearest demonstration up to that time of the dramatic potential of King's nonviolence strategy. King, however, was not present.
On March 5, King met with officials in the Johnson Administration in order to request an injunction against any prosecution of the demonstrators. He did not attend the march due to church duties, but he later wrote, "If I had any idea that the state troopers would use the kind of brutality they did, I would have felt compelled to give up my church duties altogether to lead the line." Footage of police brutality against the protesters was broadcast extensively and aroused national public outrage.
King next attempted to organize a march for March 9. The SCLC petitioned for an injunction in federal court against the State of Alabama; this was denied and the judge issued an order blocking the march until after a hearing. Nonetheless, King led marchers on March 9 to the Edmund Pettus Bridge in Selma, then held a short prayer session before turning the marchers around and asking them to disperse so as not to violate the court order. The unexpected ending of this second march aroused the surprise and anger of many within the local movement. The march finally went ahead fully on March 25, 1965. At the conclusion of the march on the steps of the state capitol, King delivered a speech that became known as "How Long, Not Long." In it, King stated that equal rights for African Americans could not be far away, "because the arc of the moral universe is long, but it bends toward justice" and "you shall reap what you sow".
Chicago open housing movement, 1966
In 1966, after several successes in the south, King, Bevel, and others in the civil rights organizations took the movement to the North, with Chicago as their first destination. King and Ralph Abernathy, both from the middle class, moved into a building at 1550 S. Hamlin Avenue, in the slums of North Lawndale on Chicago's West Side, as an educational experience and to demonstrate their support and empathy for the poor.
The SCLC formed a coalition with CCCO, Coordinating Council of Community Organizations, an organization founded by Albert Raby, and the combined organizations' efforts were fostered under the aegis of the Chicago Freedom Movement. During that spring, several white couple/black couple tests of real estate offices uncovered racial steering: discriminatory processing of housing requests by couples who were exact matches in income, background, number of children, and other attributes. Several larger marches were planned and executed: in Bogan, Belmont Cragin, Jefferson Park, Evergreen Park (a suburb southwest of Chicago), Gage Park, Marquette Park, and others.
King later stated and Abernathy wrote that the movement received a worse reception in Chicago than in the South. Marches, especially the one through Marquette Park on August 5, 1966, were met by thrown bottles and screaming throngs. Rioting seemed very possible. King's beliefs militated against his staging a violent event, and he negotiated an agreement with Mayor Richard J. Daley to cancel a march in order to avoid the violence that he feared would result. King was hit by a brick during one march, but continued to lead marches in the face of personal danger.
When King and his allies returned to the South, they left Jesse Jackson, a seminary student who had previously joined the movement in the South, in charge of their organization. Jackson continued their struggle for civil rights by organizing the Operation Breadbasket movement that targeted chain stores that did not deal fairly with blacks.
A 1967 CIA document declassified in 2017 downplayed King's role in the "black militant situation" in Chicago, with a source stating that King "sought at least constructive, positive projects."