A qualification of a man’s legal status produced by his conviction of an infamous crime and the consequent loss of honor and credit, which, at common law, rendered him incompetent as a witness, and by statute in some jurisdictions entails oth- er disabilities. McCafferty v. Guyer, 59 Pa. 110; Ex parte Wilson, 114 U. S. 417, 5 Sua. Ct. 935, 29 L. Ed. S9; State v. Clark, 00 Kan. 450, 50 Pac. 707.