Are you holding a gun to my head to make sure I do the work?.
This girl wasn't dragged across a continent in chains to raise the children of Bernard Kerik. Whether or not she was a citizen has no relevance to the question of whether or not she was a slave. The transaction was voluntary for both parties. Categorizing the arragement as "slavery" destroys any credibility your argument may have.
If you can prove Kerik was forcing the nanny to care for his children, then you had better post substantiation before using the term "slavery."
And another reason --- slave owners actually provided for their slaves --- with illegals, the providing of health care and everything else is up to the taxpayers. Slave owners provided housing for their slaves, but illegal owners figure the taxpayers can provide them generous housing subsidies. And food stamps, and WIC and free education for their children.