The Untouchables (1959) : 1x19

Chicago. Prior to May 1934, robbing state banks was not a federal offense. Bandits only had local police to contend with, and they were often understaffed, inefficient or corrupt. This led to a rash of successful, though clumsily executed, bank robberies. In this city alone, there were 422 robberies in the last year, with 221 casualties. On March 1934, Eliot Ness is meeting with his friend D.A. Beecher Asbury. Ness tells him that until bank robbery becomes a federal offense, there's not much he can about it.