Wouldn't being present in the country be a crime related to their status?
Any attempt to obtain social services or a job would make a Criminal Alien commit mutliple felonies by filing fraudulent SSI Number on employment documents and Federal Tax Withholding Forms.
Or attempts at Social Services
Or Attend a College Or University
Or apply for Pell Grant Funding
If they are here Illegally, in order to work or get support by default they MUST commit Fraud.