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HSIN is a user-driven, Web-based unclassified information sharing platform that connects all homeland security mission partners. The HSIN web-portal makes possible the sharing of Sensitive But Unclassified (SBU) information among all levels of government in support of the homeland security mission. The HSIN portal brings together homeland security partners across the spectrum from law enforcement, critical infrastructure, emergency management, and fire and emergency services to public health, intelligence, and defense.