to participate. The marchers slept on the ground outside or in large tents, and were fed mainly by local black communities. A press truck preceded them and the march was covered by national media. Along the way, members of the different civil rights groups argued and collaborated, struggling to achieve their sometimes overlapping and differing goals. SNCC and MFDP worked to expand community organizing and achieve voter registration by reaching out to the black communities in the Delta. In most places, few blacks had registered to vote since passage of the Voting Rights Act in 1965, as they were still oppressed by fear and social and economic intimidation in the Jim Crow society. Along the way, the different civil rights groups struggled to reconcile their goals and to enhance the meaning of the march to promote black freedoms. It grew slowly and was embraced by black communities along the way, and by some sympathetic whites. Other whites expressed hostility, jeering and threatening, driving close to marchers. Although overt violence was generally limited, marchers from out of state were shocked and horrified by the virulence of hate expressed in some communities, particularly Philadelphia, where three civil rights workers had been murdered in 1964 and Canton. Governor Paul Johnson, Jr. of Mississippi vowed to protect the marchers if they obeyed the law, but relations between the Highway State Police and marchers were sometimes tense. In some localities, mayors and local officials worked to keep relations peaceful. Local black communities and their churches provided food, housing and places of rest to marchers. They generally camped along the way, after returning to Memphis at the end of the first days. On the early evening of Thursday, June 16, 1966, when the marchers arrived in Greenwood, Mississippi, and tried to set up camp at Stone Street Negro Elementary School, Carmichael was arrested for trespassing on public property. He was held for several hours by police before rejoining the marchers at a local park, where they had set up camp and were beginning a night-time rally. According to civil rights historian David Garrow, an angry Carmichael took the speaker's platform, delivering his famous "Black Power" speech, arguing that blacks had to build their own political and economic power to attain independence. He used this opportunity to gain a national audience through the media to hear his speech. King, who had flown to Chicago on Wednesday to