SFVISBF, SFISS, SCISR, VULGR, SUCKER, NUDRS
Southern California is the recognized birth place of illegal soapbox racing as we know it. Originating with the San Fernando Valley Illegal Soap Box Federation and their epic rural neighborhood races, the sport quickly gained fame and notoriety. Other groups soon emerged to cater their own gravity needs but all used the SFV as a successful model. These include the San Francisco Illegal Soapbox Society, Southern California Illegal Soapbox Racers, and the Ventura Underground League of Gravity Racers. Today the Sierra Ultimate Coaster Kart Extreme Racers and the Nevada Underground Downhill Racing Syndicate are the most active groups with regularly scheduled races held nearly every month.