Question: What member of the Barker-Karpis gang was Walter Walsh involved in the capture of?
Sentence (from "Arthur Barker"): Arthur R. Barker (June 4, 1899 – January 13, 1939) 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.
Relevant evidence: Yes