The U.S. Supreme Court is scheduled to hear oral arguments Monday in a case that could overturn a long-standing precedent regarding Detroit teachers’ union fees. In a 1977 case, the High Court ruled in favor of a group of Detroit teachers who claimed they were forced to pay service fees that, in part, subsidizing their union’s political interests and activities that they did not support. The Supreme Court agreed sided with the teachers, stating unions could only charge non-member employees fees to compensate for union work, but not for activities such as lobbying. Now, a group of teachers from California is arguing that all agency fees are unconstitutional and labor leaders disagree. Unions contend a ruling for the teachers could drain union coffers and allow workers to have union protections without paying union dues.