Wu-Tang was "associated" with the Gambinos. Its been documented by the FBI. They even made a song called "Wu-Gambinos".
That is most likely false. The FBI has never documented that. When RZA endorsed hillary clinton for president i think back in 2008 fox news basically tried to use that against her which is where that rumour basically gained. They just use alot of mob terminology in their music but then again they use alot of kung fu references too.