the history of the Hells Angels into four eras, namely the First Era (1950s and 1960s) characterized by drug use and sex, the Second Era (1970s) characterized by organized crime, the Third Era (1980s) which he depicts as a period of persecution by the U.S. government, and the Fourth Era (1990s), which he characterized as a return to the original values of the club in the 1950s and 1960s. He subsequently wrote several biker-related novels. In later years, Barger worked to promote motorcycle safety: he co-authored a book on the subject with Darwin Holmstrom (the author of The Complete Idiot's Guide to Motorcycles (1998)) titled Let's Ride: Sonny Barger's Guide to Motorcycling (2010). Barger was present at the Hellraiser Ball, a tattoo and motorcycle trade exposition in Plainview, New York, sponsored by the Long Island chapter of the HAMC, which was ambushed by dozens of members of the rival Pagans motorcycle gang on February 23, 2002, resulting in one biker being killed and at least ten injured. A Hells Angels member was charged with second-degree murder and seventy-three Pagan members were indicted on federal racketeering charges in the aftermath of the incident. Increasing tensions between the Hells Angels and other motorcycle clubs led to Barger organizing a peace conference scheduled to be held in the Arizona desert following the April 2002 Laughlin River Run motorcycle rally in Laughlin, Nevada. The meeting was canceled, however, as a result of the River Run riot, a confrontation between members of the Hells Angels and the Mongols biker gang at the rally which ended with three deaths. On November 30, 2010, Barger made a guest appearance as Lenny "The Pimp" Janowitz on the season 3 finale of the FX television series Sons of Anarchy, about a fictional outlaw motorcycle club, allegedly based on the Hells Angels. Show creator Kurt Sutter spent time with Barger and other members of Hells Angels researching for the show, and acted opposite Barger in his scene. Barger returned on November 29, 2011, in the season 4 finale, part one. Barger's third guest appearance on Sons of Anarchy was during season 5, episode 10, which aired on November 13, 2012. Barger left Arizona in October 2016, returning to the Oakland chapter. On May 3, 2018, he testified in the racketeering trial of Bandidos former national president Jeffrey Fay Pike and former vice-president Xavier John Portillo after being called as a