George Borjas (harvard econ) has a blog...:

Blacks and Immigration

About a year ago, Jeff Grogger (at the University of Chicago), Gordon Hanson (at the University of California at San Diego), and I decided to write a paper examining the impact of immigration on African-Americans. The fruits of that research are now summarized in the latest issue of the NBER digest. (Click here for a copy of the--be forewarned!--very technical paper in pdf format). Here's part of the NBER summary:

Almost everybody knows that in the past 40 years, the real wages and job prospects for low-skilled men, especially low-skilled minority workers, have fallen. And there is evidence –– although no consensus –– that a rising tide of immigration is partly to blame. Now, a new NBER study suggests that immigration has more far-reaching consequences than merely depressing wages and lowering employment rates of low-skilled African-American males: its effects also appear to push some would-be workers into crime and, later, into prison.....The authors are careful to point out that even without increased immigration, most of the fall in employment and increase in jailed black men would have happened anyway. Nevertheless, the racially disproportionate effects of immigration on employment are striking.