picketing(redirected from picket line)
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The presence at an employer's business of one or more employees and/or other persons who are publicizing a labor dispute, influencing employees or customers to withhold their work or business, respectively, or showing a union's desire to represent employees; picketing is usually accompanied by patrolling with signs.
n. standing or parading near a business or government office usually with signs of protest or claims in labor disputes or public policy controversies (peace marches to pro- or anti-abortion advocates). Picketing is constitutionally guaranteed as free speech, but in some cases it may be limited by court order to prevent physical combat, blocking of entrances or threats to the public safety.