FRank Nitti hated jail because the guy was very claustrophobic(i dunno why i find this very funny smile )so he blew his head off...FRank could've snitch but he took a different style of "omerta" ....and yeah,he made tons of cash.

Mongol General: Conan, what is best in life?

Conan: To crush your enemies, see them driven before you, and to hear the lamentations of their women.