Location. Williston, Vermont. Client. Immigration and Customs Enforcement. Security Requirements : Federal Background Check and Must be U.S. Citizen. Client Mission. The Homeland Security Investigations (HSI) Tip Line (TL) is a national intake center for the receipt of alleged criminal or suspicious activity administered by U. S. Immigration and Customs Enforcement (ICE). A unit within the ICE Intelligence Directorate, the call center is located ...
