Wrong-doers (1979)

The second in command of a group of highwaymen, the only ones left of Hungary's freedom fighters in the late 17th century, has a wife who really, really wants him to come home and stop gallivanting around the countryside. The only way he can figure to do this is to inform on the group to the authorities in as harmless a manner as possible. Unfortunately, these betrayals cause the group to lose many men, and the traitor grows fearful of the authorities. He gives officials every scrap of information he has in return for a full pardon, and he returns home. His wife, when she hears of these events, is infuriated. Such betrayal is far in excess of anything she can condone, and she kills him. ~ Clarke Fountain, Rovi