Wackenhut is one of the largest private prison corporations in the US. Along with the Correctional Corporation of America (CCA), they own and manage 75% of America's private prisons.
Their main website is http://www.wackenhut.com/ ("The world's leading international security solutions group"), and there is a wikipedia article here. More information is available at  sourcewatch.
The company was founded by George Wackenhut in 1954. They are rumored to have had dealings with the CIA, and may have illegally spied on Chuck Hamel, an oil executive who tried to blow the whistle on the environmental damage caused by the Exxon Valdez oil spill. In 1979, some Wackenhut employees were involved in the rape and murder of Janet Chandler, then a 22-year-old student.
(Originally from https://secure.wikimedia.org/wikipedia/en/wiki/Wackenhut#Janet_Chandler)
"In 1979, hotel clerk and Hope College senior Janet Chandler was found dead in a snowbank along Interstate 196 near Holland, Michigan. She had been raped. Initially treated as a robbery, the case remained unsolved until a group of Hope students produced a documentary that uncovered a sex and drugs party atmosphere at the hotel, which had been occupied by dozens of Wackenhut security guards (assigned to protect the facilities of local manufacturer Chemtron during a bitter strike). The documentary prompted a reopening of the case, and arrests of six security guards and a hotel supervisor who was Chandler's roommate. In November 2007, two individuals plead guilty to charges, and the remaining four then-guards were additionally found guilty of her murder."
(Some coverage of the arrests at http://www.cbsnews.com/stories/2007/11/02/national/main3446980.shtml)