Extract: The prostitute in the brothel was slaughtered horribly so Mike could put the screws to Geary. This was an innocent girl who was treated like garbage by Mike. She was murdered and presumably dumped in a landfill,lake or shallow grave.
And for what?

Michael: Uh, senator -- you can have my answer now if you like My offer is this -- nothing Not even the fee for the gaming license, which I would appreciate if you would put up personally

I would say everyone is a reprehensible character varying only in accordance to their horrendous acts

The Geary, innocent working girl murder in which Tom himself played a big part, was beyond evil indeed
All just to get Geary in the Corleones pocket that the girl's life was worthless "as if she never existed" the cruellest of them all