The FBI marked Muslim groups for surveillance campaigns, rounding up and arresting large numbers of Muslims for infractions of the segregation laws, refusing to serve in the draft, and "acts of sedition." From 1942 onward, Elijah Muhammad, and his family were under constant surveillance. When Muhammad himself was arrested in 1942, he began his prison ministry, choosing to focus on black Americans who were incarcerated: the pimps, prostitutes, drug addicts, numbers' runners and criminals.