Just got finished watching this video on Mad Dog Vincent Coll. While I don't think Coll was "the most notorious gangster during the Prohibition era" he is a name that people recognize. I think the video was a good introduction, but I'll have to get the biography to determine where he fits in the baby faced killer pantheon.
Let's face it; it's hard to really have some one's personality come through when they are this notorious bad ass. Let's face it I compare everyone to Panzram ! Coll seems just regular raised in the slums... fights his way through institutions and life... kills an innocent child in the crossfire... gunned down at 24. Maybe in Coll's case the book will be more interesting will see.
On a more upbeat note: the National Archives has located the FBI's Luer kidnapping files for me and are checking them for privacy violations. So I should be able to get a gander soon. Cool.