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.
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….“As part of his guilty plea (Cavazos) agreed to the forfeiture of all right, title and interest in certain assets acquired or maintained by him as a result of his violation of (the RICO statute) including…the 'Mongols Registered Trademarks' or 'marks'” and admitted that the marks were subject to forfeiture to the United States.

The government has also cited the guilty pleas to Count One of the Indictment by numerous defendants besides Cavazos as proof that the Mongols Motorcycle Club is a criminal conspiracy and the name and patch are subject to forfeiture. The government has argued that the pleas demonstrate “a nexus between the violation of which the defendant has been convicted (or to which he has pled) and the property sought.”
Former Mongols MC Members now turned Government Informant.