In an op-ed published by The Wall Street Journal, Jay Greene warns voucher supporters that the teachers unions, the Harvard Civil Rights Project and others, are already sharpening their knives to attack vouchers on a different constitutional front-the 14th Amendment's Equal Protection Clause-by arguing that vouchers increase segregation. But Greene's own research shows that private schools are actually less segregated than public schools because their attendance isn't constrained by politically drawn boundaries that reinforce segregated housing patterns. Private school parents are also more willing to try "racial mixing" because those schools usually maintain discipline and safety-two common concerns of wary parents-much better than public schools. "Choosing Integration," by Jay P. Greene, The Wall Street Journal, July 8, 2002 (subscribers only)