Violence by U.S. labor unions

During the early 1800s, most violence connected with labor disputes was committed spontaneously by unorganized groups of workers. During the twentieth century, the pattern changed and most violence was caused by workers organized into unions. Although no statistics have been completed on how much violence has been committed by labor unions in the United States until recently, some indication may be obtained by examining National Labor Relations Board charges of violence filed against unions. Theories of striking and violence are discussed and an evaluation of theories on future trends in violence is made.