A letter informing a union that a company that had set up a reserved gate system to effectively confine the union's picketing of an employer on the premises it owns or manages to designated areas expects the union to cease picketing as the primary employer's presence on the premises ends. This Standard Document applies only to private workplaces but may be useful for public sector employers with private sector contractors, suppliers, or tenants. It is based on interpretations of the National Labor Relations Act (NLRA). State or local law may impose additional or different requirements, but this document will be useful and relevant to employers in every state. This Standard Document has integrated notes with important explanations and drafting tips.