Was Escape From Alcatraz based on a true story?

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Tags

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