The National Labor Relations Board (NLRB) is an independent agency of the federal government of the United States that enforces U.S. labor law in relation to collective bargaining and unfair labor practices. Under the National Labor Relations Act of 1935, the NLRB has the authority to supervise elections for labor union representation and to investigate and remedy unfair labor practices. Unfair labor practices may involve union-related situations or instances of protected concerted activity.

Strike action, also called labor strike, labour strike and industrial action in British English, or simply strike, is a work stoppage caused by the mass refusal of employees to work. A strike usually takes place in response to employee grievances. Strikes became common during the Industrial Revolution, when mass labor became important in factories and mines. As striking became a more common practice, governments were often pushed to act. When government intervention occurred, it was rarely neutral or amicable. Early strikes were often deemed unlawful conspiracies or anti-competitive cartel action and many were subject to massive legal repression by state police, federal military power, and federal courts. Many Western nations legalized striking under certain conditions in the late 19th and early 20th centuries.