By William F. Roemer, Jr. The back copy bills Roemer as "the FBI crime expert who's had more face-to-face confrontations with mobsters than anyone in law enforcement history," and goes on to name-drop Sinatra, RFK, and others.
The paperback has some edgewear and rubbing, a cracked spine, and a previous owner's name inside the front cover. It also has a page listing on a notecard, so if you're grabbing this relatively neat and very square copy for research, you'll have a head start. On what? That's your mystery to solve.