Military prison

Due to its isolation from the outside by the cold, strong, hazardous currents of the waters of San Francisco Bay, Alcatraz was used to house Civil War prisoners as early as 1861.

Following the war in 1866 the army determined that the fortifications and guns were being rapidly rendered obsolete by advances in military technology. Modernization efforts, including an ambitious plan to level the entire island and construct shell-proof underground magazines and tunnels, were undertaken between 1870 and 1876 but never completed (the so called "parade ground" on the southern tip of the island represents the extent of the flattening effort). Instead the army switched the focus of its plans for Alcatraz from coastal defense to detention, a task for which it was well suited because of its isolation. In 1867 a brick jailhouse was built (previously inmates had been kept in the basement of the guardhouse), and in 1868 Alcatraz was officially designated a long-term detention facility for military prisoners. Among those incarcerated at Alcatraz were some Hopi Native American men in the 1870s.

In 1898, the Spanish-American war increased the prison population from 26 to over 450. After the 1906 San Francisco earthquake, civilian prisoners were transferred to Alcatraz for safe confinement. On March 21, 1907, Alcatraz was officially designated as the Western U.S. Military Prison, later Pacific Branch, U.S. Disciplinary Barracks, 1915.

During World War I the prison held conscientious objectors, including Philip Grosser, who wrote a pamphlet entitled 'Uncle Sam's Devil's Island' about his experiences.

Prison history Federal prison

The United States Disciplinary Barracks on Alcatraz was acquired by the United States Department of Justice on October 12, 1933, and the island became a Federal Bureau of Prisons federal prison in August 1934. During the 29 years it was in use, the jail held such notable criminals as Al Capone, Robert Franklin Stroud (the Birdman of Alcatraz), George "Machine Gun" Kelly, James "Whitey" Bulger, Bumpy Johnson, Rafael Cancel Miranda, member of the Puerto Rican Nationalist Party who attacked the United States Capitol building in 1954., Mickey Cohen, Arthur R. "Doc" Barker and Alvin Karpis (who served more time at Alcatraz than any other inmate). It also provided housing for the Bureau of Prison staff and their families.

The majority of the prisoners at Alcatraz had been sent there after causing problems at other prisons.

During its 29 years of operation, the penitentiary claimed no prisoners had ever successfully escaped. Thirty six prisoners were involved in 14 attempts, two men trying twice; 23 were caught, six were shot and killed during their escape, and three were lost at sea and never found. The most violent occurred on May 2, 1946 when a failed escape attempt by six prisoners led to the so-called Battle of Alcatraz.

On June 11, 1962, Frank Morris, John Anglin and Clarence Anglin successfully carried out one of the most intricate escapes ever devised. Behind the prisoners' cells in Cell Block B (where the escapees were interned) was an unguarded 3-foot (0.91 m) wide utility corridor. The prisoners chiseled away the moisture-damaged concrete from around an air vent leading to this corridor, using tools such as a metal spoon soldered with silver from a dime and an electric drill improvised from a stolen vacuum cleaner motor. The noise was disguised by accordions played during music hour, and their progress was concealed by false walls which, in the dark recesses of the cells, fooled the guards.

The escape route then led up through a fan vent; the fan and motor had been removed and replaced with a steel grille, leaving a shaft large enough for a prisoner to climb through. Stealing a carborundum cord from the prison workshop, the prisoners had removed the rivets from the grille and substituted dummy rivets made of soap. The escapees also constructed an inflatable raft from several stolen raincoats for the trip to the mainland. Leaving papier-mâché dummies in their cells affixed with stolen human hair from the barbershop, they escaped. The prisoners are estimated to have entered San Francisco Bay at 10 p.m.

The official investigation by the FBI was aided by another prisoner, Allen West, who also was part of the escapees' group but was left behind (West's false wall kept slipping so he held it into place with cement, which set; when the Anglin brothers (John and Clarence) accelerated the schedule, West desperately chipped away at the wall, but by the time he did his companions were gone). Articles belonging to the prisoners (including plywood paddles and parts of the raincoat raft) were located on nearby Angel Island, and the official report on the escape says the prisoners drowned while trying to reach the mainland in the cold waters of the bay.

The MythBusters investigated the myth, concluding such an escape was plausible.

The attempt was the subject of the 1979 film Escape from Alcatraz with screenplay by Richard Tuggle; directed by Don Siegel and starring Clint Eastwood as Frank Morris, Jack Thibeau as Clarence Anglin, and Fred Ward as John Anglin.