picket
US /ˈpɪk.ɪt/
UK /ˈpɪk.ɪt/

1.
a person or group of people standing outside a workplace or other venue, protesting something or trying to persuade others not to enter during a strike.
:
•
The union organized a picket line outside the factory.
•
The workers formed a peaceful picket to demand better wages.
1.
to stand or march as a picket.
:
•
The workers decided to picket the company's headquarters.
•
They plan to picket the event all day.