Is it true that everone at alcatraz dissapeared?

No, it's not true that everyone at Alcatraz disappeared. While the infamous prison housed many notorious criminals, it closed in 1963, and most inmates were transferred to other facilities. There were, however, a few notable escape attempts, including the famous 1962 escape by Frank Morris and the Anglin brothers, which led to speculation about their fate. Officially, they were never found, but there is no evidence to suggest that everyone at Alcatraz vanished.