The leader of the far-right Proud Boys group was a prolific" informer for federal and local law enforcement, reports say. Enrique Tarrio worked undercover for authorities after he was arrested in 2012, according to a 2014 federal court document obtained by Reuters. During a Miami court hearing a federal prosecutor, an FBI agent and Mr Tarrio's lawyer described his work for law enforcement and said that he had helped convict more than a dozen people in drugs, gambling and human smuggling cases. He has become an increasingly high-profile figure as his violent group gained an elevated profile during the Trump administration. The ex-president infamously told the group to "stand back and stand by" when asked to denounce them during a presidential debate last September. They have been involved in a string of high-profile clashes in Washington DC, including the 6 January pro-Trump Capitol riot. [Mr Tarrio] was arrested in Washington DC in January two days before the riot and charged with possession of two high-capacity rifle magazines, and setting fire to a Black Lives Matter banner during a December pro-Trump demonstration in the city. Mr Tarrio was ordered to leave the city and has a June court date. During the 2014 court case Reuters says that Mr Tarrio's lawyer and prosecutors asked a judge to reduce his prison sentence after he and two defendants pleaded guilty in a fraud case related to stolen diabetes test kits. The prosecutor told the judge that Mr Tarrio had provided information that resulted in the prosecution of 13 people.