This has been going on forever.
My June 16, 2007 article shows that an INS facility for assisting ex cons with residency paperwork was erected on the grounds of at least one prison housing illegal alien felons (York County Prison in PA). The article shows that most were actual felons, not just in jail for violating immigration laws. This was under GW Bush. The article is titled "Wanted, a few bad men":
The fact that it is happening under Obama now is a blessing in disguise because now even some myopic GOP elites can see that releasing criminals onto our streets instead of deporting them is not a good thing.
But this problem may need to escalate into a civil war before most Americans even notice. By then it may be too late.
Releasing criminal aliens is nothing new for Obama:
Brewer: Releasing Jailed Illegals Ahead of Cuts 'Height of Absurdity'