A letter informing a union that a company is reestablishing a reserved gate system to effectively confine that union's picketing of an employer on the premises it owns or manages to designated areas after the reserved gate system was contaminated by persons using the wrong entrance. 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.