He was under indictment due to early intelligence provided by Pistone (at least according to Pistone).
Indictment for what and by whom? Brooklyn or Manhattan feds? Brooklyn or Manhattan DA? I know this question has been asked before but if there was an indictment made, nobody has yet found it.
Was Greca under investigation and possibly facing indictment instead?
In nest of paranoid Colombo killers who knows?
Yet Pistone in three books and Jules B in his mostly dogshit one never say... What gives?
