New laws make it more difficult to acquire residency papers and easier for the authorities to expel undocumented or unwanted foreigners.

Immigration officials did not attempt to identify trafficking victims among the thousands of undocumented foreigners they detained-notably Zimbabweans and Mozambicans-before deporting them.

As an undocumented foreigner, until a foreign trafficking victim receives a legal residency status, his or her movement is restricted to within the shelter.

The laws sharply curtailed new immigration and promoted deportation of undocumented foreigners.

However, the law prohibits and punishes those who hide and transport undocumented foreigners.

The mass expulsion plan to summarily deport all undocumented foreigners was announced by Libyan leader Colonel Muammar al-Gaddafi in January 2008.

It is estimated, however, that there may be as many as one million "undocumented foreigners" on Russian soil awaiting initial access to the procedure of refugee status determination.

From Denmark to Spain, European governments have been deporting undocumented foreigners.

The latest estimate is that the United States has 11.5 million undocumented foreigners, and it's those immigrants - the illegal ones - who have galvanized Congress.