COLUMBUS, Ohio—An Ohio congressman whose office was found to have an American flag with a swastika hanging on a wall is now pinning the blame on an unidentified group that handed out the flags with the Nazi hate symbol obscured. U.S. Rep. Dave Taylor, in a statement Thursday evening, said his Washington, D.C. office was one of “numerous” congressional offices that received the small flags, which he said initially looked normal to the naked eye. However, when one of Taylor’s staffers held an online video meeting earlier this week with the flag pinned up behind him, some of the flag’s...