"The Bully Boys" 3×09 Little House On The Prairie (6Dec1976)

The Galender brothers, two adults and a teenager, come to Walnut Grove and quickly cause trouble.

At first, Reverend Alden pleads with the townspeople to be patient with the newcomers, but it soon becomes clear the Galenders want to do nothing but cause trouble. While the men run up the bills at the Mercantile and Hanson's Mill, promising to pay with a bank draft that never appears, the boy causes trouble at school, including knocking Laura down to the ground, and giving Mary a black eye. Eventually, all of the children, except Nellie gang up on him, knock him down to the ground, and take turns beating him up.

Things get worse when the men try to attack Caroline while she was on the way to the Mercantile to deliver eggs, and when Charles goes to confront the Galenders, he ends up with three broken ribs.

Reverend Alden finally realizes that the Galenders are nothing but thugs, and invites them to church to kick them out of the church and out of the community, with the help of the townspeople.