#1 Full Blooded Italians (no member ever won a World title)
The notorious faction originated in the late 90s, back when ECW was alive and well. Every incarnation of F.B.I. has consisted of Nunzio, while other members kept being replaced by new ones with the passage of time. The group came into the picture again on WWE SmackDown in 2003, with Nunzio bringing in Chuck Palumbo and Johnny Stamboli to take on Rikishi.
Over the next few months, the stable feuded with some major names, including Kurt Angle, Brock Lesnar, Chris Benoit, Eddie Guerrero, and Chavo Guerrero.
As a result, the trio got a few opportunities to appear in SmackDown main events, but nothing much came of it. By late 2004, both Stamboli and Palumbo were released from WWE, and Nunzio was left on his own. Unlike his stablemates, Nunzio managed to hold WWE gold on two occasions, courtesy his Cruiserweight title reigns. He went on to reform F.B.I. with Vito, and the stable again made a return during Nunzio's ECW run alongside Tony Mamaluke and Trinity.