The Chocolate War(1988)

Jerry, a new student at an elite Catholic prep school, must face the hazing practices handed down by the Vigils, a group of powerful students. When teacher Brother Leon pushes the students to sell chocolates for a fundraiser, the head of the Vigils, Archie, gets Jerry to reject selling for 10 days. However, Jerry decides to keep up the refusal past the original time frame, which pits him against the Vigils and the school staff.