Former Mongols MC National President now turned Government Informant.

He has been blamed for turning the club into one of the largest criminal organizations on the West Coast of the United States during his time as President. In order to bolster the gang's ranks, he also recruited members of street gangs into the club, much to the disgust of the old school bikers. He was voted out of the club on August 30, 2008 during a meeting in Vernon, California, due to the majority of the membership believing that he was stealing from the club and provoking a war with the Mexican Mafia.

On October 21, 2008, Cavazos and 79 other Mongols were arrested by the Bureau of Alcohol, Tobacco, Firearms and Explosives after an investigation into the club, known as Operation Black Rain. Police raided his 2,760 square foot home in South Hills, West Covina, California, where he lived with his son, Ruben "Lil Rubes" Cavazos Jr, and brother, Al "the Suit" Cavazos, and seized firearms and bulletproof vests. After his arrest during the Operation Black Rain, he pleaded guilty to the racketeering charge and faces up to 20 years in prison.
http://www.mongolsmc.com/sub/outbad

Ruben “Doc” Cavazos flipped on January 23rd. He seems to have gone quickly and easily. He was the very first Mongol to plead guilty to count one of the indictment. He confessed that he led a murdering, drug dealing criminal conspiracy called the Mongols Motorcycle Club. He also confessed “that the Mongols Registered Trademarks afforded a source of influence over the RICO enterprise that defendant admits he established, operated, controlled, conducted and participated in the conduct of….”
http://www.agingrebel.com/?p=1998