A letter informing a primary employer that a company has either set up a reserved gate system to effectively confine a union's picketing of that employer on the premises it owns or manages to designated areas, or inquiring about the primary employer's presence at the premises for setting a reserved time that the primary employer will be at the premises, or both. 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.