Patrolling is a term used in the Norris LaGuardia Act to describe picketing activity to publicize a labor dispute. A federal court may not enjoin patrolling as long as it is non-violent and fraud free.
Picketing occurs for a variety of reasons. Often it involves removal of the men (a strike and work stoppage) and often its purpose is to encourage others to do the same in sympathy.
There is secondary picketing, jurisdictional picketing, area standards picketing, recognitional picketing, protected under the publicity proviso, picketing for contract breach, product picketing, a narrow form of consumer picketing in which the object is to persuade consumers to refrain from buying from a particular secondary (neutral employer) a specific product of the primary employer (the employer with whom the union has a labor dispute); informational picketing under the NLRA Section 8(b)(7)(c) permits picketing aimed at customers and the public for the purpose of informing them the employer does to have a contract with or employ members of the union losing its protection if it disrupts or curtails business. If the employer has a contract with another union, the picketing may be illegal.
We can assess the situation and advise if the picketing is in violation of the law, whether it may draw a 29 U.S.C. 187 picketing damage action and determine the validity of dual or reserve gate systems and taints to aggressively preserve the situation within the bounds of the law and free from unfair labor practices.