In Amazing #59, Kingpin was the Brainwasher from the title of the
story. He had a convoluted plan that involved having a dancer from the club
(Mary-Jane gets a new job) take photos of important people who received
invitations to the Gloom-Room-A-Go-Go club.
The camera flash made them partly dazed, and gave them a compulsion to go
back-stage where they received the full brainwashing treatment. Then, they
would perform evil deeds for the Kingpin. Earlier in the day Spider-Man had
picked up hints of criminal behaviour of some of these people. What had they
been noted doing for Kingpin?