I've read several of their studies and they are doing a better job with this issue then almost anybody. There work is very well documented with their sources referenced and verifiable. Here is an excellent example: The High Cost of Cheap Labor. Their work is far more believable then the nonsense that flows out of the National Chamber of Commerce where they just pluck a number out of their butt and expect us all to believe their self-serving assertions that we are going to be short by 10 million laborers by 2020 without documenting their methodology or their assumptions.
OTOH, most of the deportem crowd disagrees with it.
Yes, the chamber is a sell out to their big corporate buddies. And they are led by GROVER NORQUIST, the biggest GOP border sell out there is. Don't overlook his influence as the white house "Point man" on immigration.
And CIS is as good as gold.