An undercover probe of the Vagos motorcycle club has led to the arrest of a dozen people on illegal drugs and weapons trafficking charges. Authorities served warrants yesterday in Los Angeles, Orange, Riverside and San Bernardino counties following a two-year investigation. Bureau of Alcohol, Tobacco and Firearms officials say they seized an unspecified amount of narcotics and 85 firearms in the bike club raid. Federal officials say they had used an informant to buy weapons and drugs with government money to build their case. The Vagos motorcycle club, which was founded in San Bernardino in the 1960s, says they have committed no wrongdoing.