On this date in 1933, three men — believed to be outlaw, and former lawman, Verne Miller, along with bank robbers Charles “Pretty Boy” Floyd and Adam Richetti — attempted to free Frank “Jelly” Nash from Federal custody in Kansas City. A gunfight ensued, leaving three police officers, an FBI Agent, and Frank Nash dead.
FBI History: Famous Cases Kansas City Massacre – Charles Arthur “Pretty Boy” Floyd
Wikipedia: Kansas City Massacre