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Six people were killed during an escape attempt and riot at San Quentin State Prison in California; the subsequent trial of six inmates was the longest in state history at the time.

San Quentin Six

American inmates who tried to escape in 1971

The San Quentin Six were six inmates—Fleeta Drumgo, David Johnson, Hugo Pinell, Johnny Spain, Willie Tate, and Luis Talamantez—at California's San Quentin State Prison who were charged with criminal actions related to an August 21, 1971 escape attempt and prison riot. The riot…
Source: Wikipedia (CC BY-SA)

San Quentin Rehabilitation Center

Men's prison in California, US

San Quentin Rehabilitation Center (SQ), formerly known as San Quentin State Prison, is a California Department of Corrections and Rehabilitation state prison for men, located north of San Francisco in the unincorporated place of San Quentin in Marin County.
Source: Wikipedia (CC BY-SA)