The right to picket is protected when it is for a lawful purpose, conducted in an orderly manner, and publicizes a grievance of some kind. The police have the authority to impose conditions and the number of pickets where they believe large groups of people are likely to cause disruptive or criminal acts. The following are the generally accepted rules that control and regulate walkouts and strike actions throughout the country. Picketing is legal as long as it does not limit access of employees, customers, visitors, vehicles, deliveries, etc., to the business and any of its components.”]
Source: https://www.csoonline.com/article/2124527/how-security-should-handle-pickets-and-strikes.html