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From Wikipedia, the free encyclopedia. In its 29 years of operation, there were 14 acknowledged attempts to escape from Alcatraz prison involving 34 inmates (two, Joseph Cretzer and Sam Shockley, tried twice). Officially, every escape attempt failed, and most participants were either killed or quickly re-captured.
In actuality, there were three separate occupations of Alcatraz Island, one on March 9, 1964, one on November 9, 1969, and the occupation which lasted nineteen months which began on the 20th of November, 1969. The 1964 occupation lasted for only four hours and was carried out by five Sioux, led by Richard McKenzie.