NPR has interviews with Carol Swain and Cord Jefferson:

Despite the decline in illegal immigration, its efect on certain minority groups remains a point of contention. Host Michel Martin discusses the issue with writer Cord Jefferson and Vanderbilt University law professor Carol Swain. Jefferson recently wrote an article titled 'How Illegal Immigration Hurts Black America' for the online magazine theRoot.com.

Carol Swain points out that legal H-2B guestworkers are just as bad for black, (and low-skilled white) workers as illegals. Cord Jefferson has been concentrating more on illegals, because they're more exploitable.