Yes they did it on his orders. The reason was because in May 1979 Dellacroce was indicted along with Plate who worked as a loanshark/hitman for Dellacroce in Miami. Tony Plate was a very sick fuck from what I have read. He once jumped onto the desk of someone who owed him money and threatened to bite chuncks out of his flesh. So neil was afriad that if Plate was sitting next to him it would make the jury convict him so he ordered the Bergin guys to whack him. in august 79 he disappeared. Gotti went down to Miami but I don't know his true involvement in the killing.