They claim that local police are "using the program to target communities of color, including disproportionate numbers of Latinos in particular places, for arrest." I guess that all depends on what they mean by "disproportionate", since the great majority of illegal aliens in the U.S. are (...drumroll...) Latinos, specifically from Mexico.
They say 'We applaud your recent remarks acknowledging, that "there is a long history in this country of African Americans and Latinos being stopped by law enforcement disproportionately."' Obama said that at the start of his "post-racial healing campaign" for the Crowley-Gates issue (link), and most people might consider that one of the low points of his presidency (so far).
They claim there's "well-documented evidence that local law enforcement agencies are using 287(g) powers to justify and intensify racial profiling", yet the only case I'm aware of them bringing over this issue is the one described here.
UPDATE: In addition to those listed below, another signer is the Ella Baker Center, which was co-founded by Van Jones (ellabakercenter.org/page.php?pageid=16&contentid=100). He's now the "special advisor for Green Jobs, Enterprise and Innovation at the White House Council on Environmental Quality" and involved in a boycott of Glenn Beck.
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