Charlie "Lucky" Luciano

[theshadowknows]

Partly because of the Mafia Mystique, partly due to how that Mystique connects with the JFK Assassination.

Good ol' Sam Giancana. CIA used the Mafia to try eliminate Castro since the Mafia had their own reasons for wanting Castro gone after he kicked them out of the casinos in Havana. It was perfect plausible deniability for CIA. As was using the mafia to eliminate JFK. Again, the Mafia had their own reasons, especially with Bobby. RFK really pissed off the mob, but part of me wonders if it went deeper than that considering Kennedy Sr's unsavory connections during prohibition.
 

I remember Lansky being quite the character, powerful ...but not powerful enough IIRC since they would not let him return to Israel.

There's an interview with the man himself about that.