U.S. Rep. Cori Bush claimed on social media that white supremacists shot at protesters in Ferguson, Missouri, in 2014, but the city’s police chief said he was unaware of any such incident. Bush, a first-term Democrat from St. Louis, made her name as an activist leader in Ferguson after the fatal police shooting of 18-year-old Michael Brown on Aug. 9, 2014. Brown, who was Black, died in a street confrontation with a white police officer, Darren Wilson. Wilson was never charged but resigned in November 2014. The shooting and a grand jury’s decision not to charge Wilson led to months...