Is the movie Escape from Alcatraz based on a true story?

Related questions

1. Who escaped from Alcatraz and survived?
2. Why did Alcatraz shut down?
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4. Did families live on Alcatraz?
5. Was the rock filmed at Alcatraz?
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7. Was the movie Escape from Alcatraz filmed at Alcatraz?
8. Has anyone successfully escaped Alcatraz?
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10. Is the movie the rock based on a true story?

Tags

1. #alcatraz
2. #movie
3. #morris
4. #total
5. #supposedly
6. #history
7. #during
8. #story
9. #escape
10. #frank
11. #attempts
12. #eastwood
13. #which
14. #plays
15. #attempt
16. #believe
17. #clint
18. #behind