The Myth of Voluntary Unions: "Not every single union is involved in violence, but the vast majority have apparently been. They found six unions in their sample for which there was no record of violence: four government employee unions, a musicians' union, and the 'Brotherhood of Maintenance of Way Employees.' The most violence-prone unions in their sample were the Teamsters, Mine Workers, Steelworkers, Auto Workers, State, County and Municipal Employees, Machinists, Food and Commercial Workers, and the National Education Association."