Citizenship and Immigration Services means: U.S. GOVERNMENT is the successor to the investigation and processing arm the US Immigration and Naturalization Services INS. The INS was disbanded in 2003 and the enforcement arm of the INS moved to the Immigration and Customs Enforcement ICE. The INS was formerly part of Justice Department. Now, the CIS is part of Department of Homeland Security DHS. Each year hundreds of thousands are imprisoned by the CIS, mostly because of traffic violations or petty paperwork errors. (in Community Dictionary, added by Daciano Gallego)