Tom Diaz, 72, is one of the most prominent gun control advocates in the United States. A former senior policy analyst at Washington's Violence Policy Center — which considers firearms violence to be a public health issue rather than criminal issue — Diaz wrote Making a Killing: The Business of Guns in America in 1999. It explored the links between political lobbying by the National Rifle Association (NRA) and gun manufacturers. Last year, dismayed by a decade of... (GunPolicy.org)