The corkscrew political career of the mayor of Fall River, Mass., took another turn on Friday as federal prosecutors announced he had been charged with bribery and extortion in what they said was a scheme to shake down marijuana vendors in return for his support.

News of the indictment, announced by the United States Attorney’s Office for the District of Massachusetts, was the latest political upheaval to rock this city, which is about 50 miles south of Boston.

In less than a year , the mayor, Jasiel F. Correia II , has already faced separate federal fraud and tax evasion charges, a recall election in which voters chose to oust him from office, but then in a peculiar twist ended up keeping his job because he was the top vote-getter for mayor in the same election.

Mr. Correia, who at 24 became the city’s youngest mayor when he took office in January 2016, agreed to issue so-called nonopposition letters, which are required to run a medical or recreational marijuana business in Massachusetts, in return for cash bribes and other payments, federal prosecutors said in a news release.