SYMPATHY STRIKE: A labor strike undertaken by a union without particular grievances against a firm to show support for a strike undertaken by a second union that does have grievances with the firm. The primary purpose of a sympathy strike is to demonstrate solidarity among unions. However, given labor laws, such a strike can create problems for the sympathetic union. See also | labor union | strike | collective bargaining | mediation | arbitration | lockout | wildcat strike | Taft-Hartley Act |