In this April 20, 1936 file photo, armed troops march past German Chancellor Adolf Hitler during a parade in Berlin to celebrate his birthday. As the Nazis increasingly targeted Jews and others they considered enemies, they moved in 1938 to loosen gun statutes for the loyal majority, said Bernard Harcourt, a University of Chicago professor of law and political science who has studied gun regulations under Hitler. The 1938 law is best known for barring Jews from owning weapons, after which the Nazis confiscated guns from Jewish homes. But Harcourt points out that Hitler's gun law otherwise completely deregulated acquisition of rifles, long guns and ammunition. It exempted many groups from requiring permits. The law lowered the age for legal gun ownership from 20 to 18. And it extended the validity of gun permits from one year to three years. (AP Photo)