I have never heard of Genovese, Adonis & Anastasia carrying out the assassination of Maranzano. Rather, these three along with Bugsy Siegel (not Red Levine) supposedly did the Coney Island job on Masseria

However, Valachi's account does appear to contradict the widely told story of how Siegel and other Jewish gangsters posed as IRS agents to get into Maranzano's office with no resistance