1993 - Brady Handgun Violence Prevention Act
On November 30th, President Bill Clinton signed into law the Brady Handgun Violence Prevention Act. Named after James Brady, former press secretary for Ronald Reagan, the law required gun purchasers wait up to five days for a backgroun check before purchasing a handgun. In 1998 the five day waining period was replaced by a computerized criminal background check. James Brady was shot during the attempted assassination of former President Reagan in 1981.

This photo of James Brady and President Clinton is from the dedication of the James Brady Press Briefing Room.
Additional information: Firearms and Crime Statistics - Bureau of Justice Statistics