The Chicago Freedom Movement declared its intention to end slums in the city. It organized tenants' unions, assumed control of a slum tenement, founded action groups like Operation Breadbasket, and rallied black and white Chicagoans to support its goals. In the early summer of 1966, it and Bevel focused their attention on housing discrimination, an issue Bevel attributed to the work and idea of AFSC activist Bill Moyer. A large rally was held by Martin Luther King at Soldier Field on July 10, 1966. According to a UPI news story that ran the next day, "About 35,000 persons jammed Chicago's Soldier Field for Dr. King's first giant 'freedom rally' since bringing his civil rights organizing tactics to the city.…" Other guests included Mahalia Jackson, Stevie Wonder, and Peter, Paul and Mary.