I'm sure Paulie's betrayal would fall into this category.
If Tony would have found out for certain Paulie was the one who told John Sac about his wife being mocked, he would have been a goner.
"...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
