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march, protest, rally, parade, picket, mass lobby
picket
picket line
Perhaps you mean a public demonstration by UNION MEMBERS, not just workers. And the purpose is not to inform the general public. Picket lines are formed to signal other unions that the employer has raiosed the ire of a union and suppliers should not cross the picket line, harming the employer.
A Picket is a demonstration by workers for the purpose of publicizing alleged grievances, persuading the public not to do business with the affected company.
Bronson Picket's birth name is Bronson Francisco Picket.
The Picket-Guard was created in 1861.
Bronson Picket is 6' 3".
You call it a picket.
The duration of Picket Fences is 2520.0 seconds.
No, cross the picket line!
Picket Fences ended on 1996-06-26.