This is hardly a neutral organization. People have argued for a long time about what the net value or cost of illegal immigration is. The issues are ridiculously complex, and most of these estimates are based on pretty shallow assumptions.
For instance, we know from recent experience that citizens will not immediately leap to take the jobs vacated by illegals, because crackdowns on illegals have lead to crops rotting in the fields in some places, with
huge losses to business.
"All of this is to say if you're going to stop illegal immigrants from doing a job you should be prepared for the job, and perhaps even the business itself, to go away. You may think this is worth it, but you should at least be acknowledging the risks and weigh them against what, if anything, you think is being gained."