Editing Alcatraz (section)

==Post Prison Years==
By decision of Attorney General Robert F. Kennedy, the penitentiary was closed on March 21, 1963. It was closed because it was far more expensive to operate than other prisons (nearly $10 per prisoner per day, as opposed to $3 per prisoner per day at Atlanta), half a century of salt water saturation had severely eroded the buildings, and the bay was being badly polluted by the sewage from the approximately 250 inmates and 60 Bureau of Prisons families on the island. The United States Penitentiary in Marion, Illinois, a new, traditional land-bound prison opened that same year to serve as a replacement for Alcatraz.

===Native American Occupation===
Main article: Occupation of Alcatraz
Beginning on November 20, 1969, a group of Native Americans from many different tribes (many individual Native Americans relocated to the Bay Area under the Federal Indian Reorganization Act of 1934), occupied the island, and proposed an education center, ecology center and cultural center. According to the occupants, the Treaty of Fort Laramie (1868) between the U.S. and the Sioux returned all retired, abandoned or out-of-use federal land to the Native people from whom it was acquired.

During the eighteen months of occupation, several buildings were damaged or destroyed by fires, including the recreation hall, the Coast Guard quarters and the Warden's home. The origins of the fires are unknown. A number of other buildings (mostly apartments) were destroyed by the US Government after the occupation had ended. Graffiti from the period of Native American occupation are still visible at many locations on the island.

During the occupation, the Termination Policy, designed to end federal recognition of tribes, was rescinded by President Richard Nixon, and the new policy of self-determination was established, in part as a result of the publicity and awareness created by the occupiers. The occupation ended on June 11, 1971.