Question: Rufus Roy McCain, was a prisoner at Alcatraz who attempted escape in which year, with Henri Young and Arthur Barker, Barker was an American criminal, the son of Ma Barker and a member of the Barker-Karpis gang, founded by his brother Fred Barker and Alvin Karpis?
Sentence (from "Arthur Barker"): Generally known as "Doc", Barker was typically called on for violent action, while Fred and Karpis planned the gang's crimes.
Relevant evidence: No