Robert Franklin Stroud, known as the "Birdman of Alcatraz", was a convicted murderer, American federal prisoner and author who has been cited as one of the most notorious criminals in the United States. During his time at Leavenworth Penitentiary, he reared and sold birds and became a respected ornithologist. From 1942 to 1959, he was incarcerated at Alcatraz, where regulations did not allow him to keep birds. Stroud was never released from the federal prison system; he was imprisoned from 1909 to his death in 1963.

United States Penitentiary, Alcatraz Island, also known simply as Alcatraz or The Rock, was a maximum security federal prison on Alcatraz Island, 1.25 miles (2.01 km) off the coast of San Francisco, California, United States. The site of a fort since the 1850s, the main prison building was built in 1910–12 as a U.S. Army military prison.