I tried to respond to some of these last night. The site went down for maintenance, and I don't see my response. Also, I think you re-posted these. They're good photos. Next time, please post one at a time and wait for response. The ones I recognize (in order):
Whitey Bulger
Detroit's Purple Gang
I'm guessing Isador "Kid Kann" Blumenfield (guy at left looks like Moe Annenberg)
Davie Berman of the Purple Gang
Salvatore Maranzano after his encounter with Red Levine and his band of "treasury agents."
Mickey Cohen
Bulger again
Gallo brothers
Jacob (little Augie) Orgen
Gus Greenbaum, who took over the Flamingo after Bugsy's demise
Verne Miller
Little Moe Sedway, Greenbaum's Flamingo partner
Jack Legs Diamond
Murray (the Camel) Humphreys, a Capone associate and long-time labor rackets guy for the Outfit
James (King of the Bombers) Belcastro, one of Capone's men
Moe Dalitz (at the Keefauver hearings in 1951; his partner, Sam Tucker, was cropped out)
Homer Van Meter of the Dilligner mob?