Graduate student employee unionization
Graduate student employee unionization, or academic student employee unionization, refers to labor unions that represent students who are employed by their college or university to teach classes, conduct research and perform clerical duties. As of 2014, there were at least 33 US graduate employee unions, 18 unrecognized unions in the United States, and 23 graduate employee unions in Canada.
Source: Wikipedia — Graduate student employee unionization (CC BY-SA 4.0)