Illegal Immigrants are non-citizens. They are generally Liberal.
If they are caught, they will face deportation and their recruiter is liable to receive a charge of using illegal labor (the Conservatives, evil though they are, have a seeming appreciation of irony).
Sweatshop Workers are always illegal immigrants.
Their treatment is overseen by the Immigration issue.
If Immigration and Death Penalty are both at C+, arrested illegal immigrants are executed.
If Immigration is at C+ to L, arrested illegal immigrants are immediately deported without trial.
At L+, illegal immigrants are not deported.