https://www.reuters.com/article/us-retail-trading-usa-congress/robinhood-hedge-fund-chiefs-grilled-by-lawmakers-over-gamestop-reddit-rally-idUSKBN2AI1C4 >Wall Street hedge fund managers, the chief executives of Robinhood and Reddit, and a YouTube streamer known as Roaring Kitty were grilled on Thursday by U.S. lawmakers about the Reddit rally in shares of GameStop Corp.