Marty said that whole scene was improvised by Pesci and the other actors. Pesci has said before that he's a method actor. He thinks of someone he knows that's similar to the character he's playing, and just becomes that person. I wouldn't doubt he was portraying someone he grew up with in Newark.
"...the successful annihilation of organized crime's subculture in America would rock the 'legitimate' world's foundation, which would ultimately force fundamental social changes and redistributions of wealth and power in this country. Meyer Lansky's dream was to bond the two worlds together so that one could not survive without the other." - Dan E. Moldea
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