Here are a few suspects or killers in prominent U.S. cases that might fit into that category.
Wade Michael Page The suspect in the killings of six people at a Sikh temple in Wisconsin on Aug. 6 -- killed by authorities -- was dismissed from a military career and a recent trucking job because of excessive use of alcohol. The Southern Poverty Law Center describes Page as ''a frustrated neo-Nazi who had been the leader of a racist white-power band.'' At left, Page, 40, is seen on a Myspace.com Web page for the musical group End Apathy. Reuters Buy Photo