Legend. But...
In 1933, Humphreys helped Al Capone arrange a fake kidnapping. The "victim" of this crime was to be John "Jake the Barber" Factor, a British con artist wanted in his home country for stock swindling. Factor, a Capone friend, was facing extradition proceedings when Humphreys faked his disappearance. In addition, Humphreys framed Capone rival Roger "Terrible" Touhy with the kidnapping charge. Touhy received a 99 year prison sentence.
Sounds like Capone and the Hump were a couple of rats. They used law enforcement to set up and arrest their rival Touhy. That's ratting to me.
Silly. That's not considered ratting. The guy didn't commit the crime, and they never talked to the cops.
Most of the mob guys used their police connections to crack down on the black gangsters to take over their rackets. 
