Economic Definition of picket line. Defined.
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Term picket line Definition: This is the traditional method of demonstrating that a labor union is on strike against an employer, whereby union members carry picket signs and walk in a line in front of the employers plant, factory, or place of business. The pickets carried by the striking workers contain messages documenting their striking status and some of their grievances with the employer. The act of walking in an orderly fashion means that they are not engaged in other activities that might be illegal. Crossing the "picket line" is symbolic of attempts to break a streak and to disagree with the goals of the striking workers.