A favorite theory of many JFK assassination buffs is that the mob, led by Chicago boss Sam Giancana (pictured right), ordered a hit on the president as payback for double-crossing them after they helped him win the 1960 presidential election. When Kennedy won Illinois, many Richard Nixon supporters claimed that then-Mayor Richard J. Daley's political machine in Chicago had fixed the city election, thus helping Kennedy carry the state. But others, most notably investigative reporter... more ›