Twenty anxious defendants waited in a Dallas courtroom on Feb. 26, 1935 for a federal jury to come to a verdict in the “harboring” trial of Bonnie and Clyde’s closest kin and staunchest friends.

BOSTON — Weapons recovered at the scene where infamous criminals Bonnie and Clyde were killed in 1934 will be part of an auction that ends next week. The “Old West, Outlaws, Lawmen, and Gangsters” ...