PayPal is famous not just for its pioneering of electronic payments but also for its mafia—a group of successful alums who went on to start or fund companies ranging from Yelp and LinkedIn to Palantir and Affirm. Now Elon Musk, the gang’s most famous capo with his vast Tesla wealth, has spawned a newer mob that might one day rival the original. A string of former employees at the carmaker have gone on to form electric vehicle and battery companies, mostly in California. (Dozens of others have landed at EV companies like busmaker Proterra and truckmaker Rivian.) These ex-Tesla staffers are poised to have an outsize impact on the $6 trillion global auto industry in the decades to come.