Top Criminal Underworld Figure in Galactic History

Reminds me that Australian law ruled back in October that the F-word as no longer offensive here, lol.

Boba Fett

He makes anyone in his path his *****

If you aren't already his *****, it's because you had the good fortune not to have met him yet

Smugglander.

Hard to top Emperor. >:]

probably Plagueis/Palpatine TBH. In all the books the criminal element in the galaxy is always portrayed as being puppets or inferior to the Sith collective.