A Democratic state representative who has organized anti-police protests in St. Louis rapped about shooting “snitches” and dragging their dead bodies behind cars in a series of rap videos. State Rep. Bruce Franks Jr., a freshman lawmaker elected in November 2016, used the rap name Ooops as part of a rap group called St. Louis Cypher. In a series of videos, some as recent as 2015, Franks rapped about shooting and stabbing people to death and hiding the evidence. “I off them if they snitch, I put a shotty to their body, send them straight to the reverend! I put...