Alcatraz needed extra security to hold the super criminals. It was built on an island 2 miles away from land so the criminals couldn't escape by swimming. Alcatraz also needed super thick walls so the prisoners couldn’t escape. The security was needed to make sure the super criminals were under control.
Prisoners began to escape from Alcatraz and that made people scared. The most popular gangster, Al Capone, was at Alcatraz. Alcatraz was designed