Draft evasion accounted for about 4% of the total inducted. About 373,000 alleged evaders were investigated with just over 16,000 being imprisoned. Opposition was nonetheless encountered, especially in the northern cities where some African-Americans protested the system. The Nation of Islam was at the forefront, with many black Muslims jailed for refusing the draft, and their leader Elijah Muhammad was sentenced to federal prison for 5 years for inciting draft resistance. Organized draft resistance also developed in the Japanese American internment camps, where groups like the Heart Mountain Fair Play Committee refused to serve unless they and their families were released. 300 Nisei men from eight of the ten War Relocation Authority camps were arrested and stood trial for felony draft evasion; most were sentenced to federal prison. American Communists also opposed the war by forming the "American Peace Committee", which tried to organize a coalition of anti-war groups. This lasted until Germany attacked the Soviet Union in June 1941, whereupon they changed the committee's name to the "American People's Committee" and supported aid to Britain, the draft and other preparations for war.