The Tusken Raiders, also known as Sandpeople, are minor antagonists in the 1977 movie Star Wars: A New Hope and it's 1999 and 2002 prequels The Phantom Menace and Attack of the Clones. In their first appearance in A New Hope, they were referred to as the Sandpeople. They are nomadic bandits who live on the fringes of society on the desert planet Tatooine.
The Phantom Menace
They make an brief appearance here, firing off shots at the Pod Racers competing in the Boonta Eve race.
Attack of the Clones
A group of Tusken Raiders kidnap Shmi Skywalker. Her son Anakin comes to find her, and she dies in his arms. Anakin then terminates the whole clan, men, women, and children, in revenge, leading him down the path to the Dark Side.
A New Hope
The Tusken Raiders make a brief appearance and are referred to as "sand people." They beat up Luke Skywalker, partly disassemble the droid C-3PO, and almost kill Luke before being scared off by Obi-wan Kenobi.