On January 22, 1934, a fire started in the basement of Hotel Congress and spread up the elevator shaft, destroying the third floor. Firefighters were tipped to go back in for heavy bags. One of the firefighters recognized a member of John Dillinger's gang. The tip led police to the gang, and Dillinger was captured in Tucson that week. The hotel had opened in 1919. Tucson has marked the capture with Dillinger Days.
Source: Hotel Congress, official hotel history; Federal Bureau of Investigation, Famous Cases: John Dillinger; Hotel Congress, Dillinger Days event materials