https://www.reuters.com/article/us-retail-trading-usa-congress/robinhood-hedge-fund-chiefs-face-irate-questions-at-gamestop-hearing-idUSKBN2AI1C4 >The head of trading app Robinhood and Wall Street hedge fund managers on Thursday fielded a barrage of questions in the U.S. Congress about their role in the GameStop trading frenzy, at times being cut off by irate lawmakers who found their answers wanting.