an Economic Bill of Rights. May 12 was Mothers' Day, and five thousand people marched to protest 1967 cuts to Head Start, as well as Senator Long's description of mothers on welfare as "brood mares" and other elements of mounting racist stigmatization. Throughout May, nine major caravans of poor people gathered and prepared to converge on Washington. One caravan originated at the Edmund Pettus Bridge in Selma, Alabama. Others originated in Los Angeles, Seattle, and San Francisco. Most media attention was focused on Mule Train, which departed on May 13 (the last to leave) from Marks, Mississippi. Marshals for many of the caravans were militant young Black men, often affiliated with radical groups like the Memphis Invaders, who had been connected to the outburst of violence in March. The FBI gathered copious information (including photographs) about each caravan, concerning participants, route, finances, and supplies. The marchers received assistance from the Department of Justice's Community Relations Service Division, newly led by Roger Wilkins, which negotiated with local governments to help Campaign proceed smoothly. The only incident of police brutality on the march came at Detroit's Cobo Center, where police surrounded a stalled van, provoking a standoff that eventually led to marchers being clubbed and stomped by mounted police. Resurrection City On Tuesday, May 21, 1968, thousands of poor people set up a shantytown known as "Resurrection City," which existed for six weeks. The city had its own zip code, 20013. Building the camp The City initially scrambled to build shelters and meet basic needs of its initial 3000 residents. Many people volunteered to help construct shelters for the campaign's Building and Structures Committee, chaired by University of Maryland architect John Wiebenson. The group struggled in choosing a name and a location for the demonstration, and did not decide on "Resurrection City" and the National Mall until two days before the arrival of marchers. In exchange for a permit to camp on the most famous strip of grass in the United States, the campaign agreed to limit the city to 3000 people and 36 days. Under the leadership of Walter Reuther, the United Auto Workers donated $55,000 to support the establishment of Resurrection City. The group was, of course, poor to begin with, and had now gambled on survival in a strange environment. The Baltimore Afro-American reported that the camp, receiving a flood of donations and volunteers, had reached a sort of