Regarding Dan Mitrione, the basis for the character portrayed by actor Yves Montand in "State of Siege", I would invite those interested to research Mitrione's background. The US history of training Brazilian and Uruguayan police in interrogation techniques have been heavily documented.
To quote the book The Shock Doctrine: "According to court testimony quoted in the country's truth commission report, "Brazil: Never Again", published in 1985, military officers attended formal "torture classes" at army police units where they watched slides depicting various excruciating methods. During these sessions, prisoners were brought in for "practical demonstrations" - brutally tortured while as many as a hundred army sergeants looked on and learned. The report states that "one of the first people to introduce this practice into Brazil was Dan Mitrione, an American police officer. As a police instructor in Belo Horizonte during the early years of the Brazilian military regime, Mitrione took beggars off the streets and totured them in classrooms so that the local police would learn the various ways of creating, in the prisoner, the supreme contradiction between body and mind." (see footnote 73, page 113, The Shock Doctrine for references).
Thereafter, Mitrione moved on to conduct police training in Uruguay, where, in 1970, he was kidnapped by Tupamaro guerrillas. I won't give away the movie but suffice it to say that the Tupamaros were well aware of who Mitrione was.