When a crooked private detective worried his life was threatened by a brutal loan shark, he turned to IRS Special Agent William Paulin — and wound up helping the feds uncover some of the deepest secrets of mobbed-up Cicero.
When a bookmaker got jittery while secretly recording mobsters for the feds and worried Outfit guys would throw him out a high-rise window, Paulin was sent to calm him down.
For roughly a quarter century, Paulin, 54, has been a go-to guy for the feds as a top mob investigator, uncovering millions of dollars in rip-offs and taking down top Outfit bosses.
Next week, Paulin will retire.
It's a loss to the federal team that battles the Outfit, authorities said.