I forget. Here's the bit about Russo's theory. If you go to the page the sourced stories might lead to more information:

"According to Gus Russo, author of The Outfit, there were Mob insiders who believed Jackson was killed for raping an imprisoned Mob-connected burglar's wife. Russo also states that Mrs. Humphreys, wife of Outfit fixer Murray "The Camel" Humphreys, asserted the conversation where the government learned about Jackson's fate was staged by mobsters who were aware that the government had planted a microphone. These possibilities have not been verified.[2][3][4][5]"