At a 1991 administrative law trial of the Greyhound bus company following a strike, the National Labor Relations Board argued that the company illegally fired workers who abandoned their buses and walked off the job in mid-route. NLRB lawyers argued at length that Greyhound had committed an illegal "unfair labor practice" by firing two strikers who were convicted and sentenced to jail for shooting at a Greyhound bus that was carrying passengers. The NLRB argued that the workers were engaged in union activities during the strike and shooting and thus that their activities were protected under federal labor law and that Greyhound owed them back pay—including the time they spent in jail.

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