The Mad Bomber was the nickname given to George Metesky, an American serial bomber who terrorized New York City from 1940 to 1957. Metesky planted more than 30 bombs in public places, including movie theaters, phone booths, and libraries, causing extensive property damage but no fatalities.
From Wikipedia
The Mad Bomber, a.k.a. The Police Connection and Detective Geronimo, is a 1972 film produced, directed, and scripted by Bert I. Gordon. It stars Vince Edwards, Chuck Connors and Neville Brand.