Rogue traders who have been influencing social media investors through their Reddit group have been slapped down by restrictions placed on their favorite stocks Thursday. One of these, GameStop Corp. plunged at mid-morning after moves were made to curtail its trading. Among those taking action were Robinhood Markets, TD Bank and Interactive Brokers Group Inc. GameStop stock plummeted as much as 68% when trading was halted. CBC Here is an earlier analysis from Mike Eppel.