Anastasia and Mangano were usually in conflict, even though they worked together for 20 years. On numerous occasions, Anastasia and Vincent Mangano came close to physical conflict. Vincent Mangano felt uncomfortable with Anastasia's close ties to Lucky Luciano, Frank Costello, Joseph Bonanno and other top mobsters outside his family. Mangano was also jealous of Anastasia's strong power base in Murder Inc. and the waterfront unions. In April 1951, Vincent Mangano disappeared without a trace, while his brother Phillip was found dead. No one was ever charged in the Mangano brothers' deaths and Vincent's body was never found. However, it is generally believed that Anastasia murdered both of them.