picketing

Picketing is the act of standing or marching near a workplace, business, or other location to protest or draw attention to a grievance, typically during a labor dispute.

Picketers usually carry signs and try to discourage others from entering the premises or doing business there.

The union organized picketing outside the factory gates.

The term extends beyond labor contexts to any organized demonstration at a specific location: Animal rights activists were picketing the research facility.