"Furthermore, they did not suggest that poor people be locked up in pens like animals..."

An actual correction currently running at The New Yorker's website:

"In his December 17th piece, 'None of the Above,' Malcolm Gladwell states that Richard Herrnstein and Charles Murray [...] proposed that Americans with low I.Q.s be "sequestered in a 'high-tech' version of an Indian reservation." In fact, Herrnstein and Murray deplored the prospect of such "custodialism" and recommended that steps be taken to avert it. We regret the error."