From the Chicago Tribune:
Anthony Holmes, 63, said that on May 29, 1973, Burge and other officers burst into the South Side home, arrested him at gunpoint and took him to the old Area 2 headquarters. There, in an interview room, he initially denied any involvement in the murder.
It was then that Burge entered the room with a mysterious device, Holmes said.
"He took the box and plugged it into the wall," said Holmes, an imposing figure with his hair pulled into a tiny bun and tattoos dotting his arms. "He put one wire on my ankle (shackles) and I assume he put the other one on my handcuffs... He said, 'N-----, you're going to tell me what I want to know."
[snip]
"You expect to get beat up by the police, but you don't expect to get shocked, electrocuted, bags put over your head, stuff like that,"Holmes said. "I still feel the effects. I feel withdrawn, helpless."
Burge is thought to have tortured hundreds of prisoners for confessions. Thought by who? US Attorney for Northern Illinois Patrick Fitzgerald (video over the fold).