Career
He eventually became the leading underworld figure in Wichita, Kansas during Prohibition, specifically becoming involved in bootlegging and narcotics. He was also considered one of the top fences in the Midwestern United States buying negotiable bonds and laundering money. Floyd may have, in fact, gotten his start in the underworld by transporting bootleg liquor for Callahan before becoming a bank robber.
Callahan was eventually convicted of drug smuggling and was sentenced to 25 years imprisonment.
He would serve only seven years before his release and retired to Wichita where he died in his sleep on June 8, 1936, at age 70.
