Alcatraz was a prison located on an island in the bay off of San Francisco. (PROSE: Unnatural History)
Al Capone was sent to Alcatraz. (PROSE: Players)
The Seventh Doctor, using the alias Richard A Fells, posed as a prisoner in Alcatraz to locate and deal with a Threckon which was feeding on the emotions of the prisoners there. (PROSE: Inmate 280)
The Twelfth Doctor said that it was discovered on Alcatraz that the colour yellow had a provocative effect on prisoners, while the colour pink had a calming effect. (PROSE: The Blood Cell)