A scholarship program for poor kids survives a union legal assault.

School vouchers may be the most effective anti-poverty program around, yet they’re fought tooth and hammer by the teachers unions. Late last week the North Carolina Supreme Court awarded a victory to poor kids by protecting vouchers from another union attack.

Two years ago Tar Heel Republicans passed a modest reform offering low-income students $4,200 scholarships to attend qualifying private schools. The law requires, among other things, that private schools report graduation rates and test scores. It also mandates an annual report comparing the learning gains of voucher recipients and public school students.

Taxpayer plaintiffs backed by the union argued in a lawsuit that vouchers accomplish no “public purpose” because private schools don’t have to adhere to such state educational standards as teacher licensing requirements. You have to admire the gall of a union to argue that private schools are “unaccountable” when only one in five black fourth-graders at North Carolina public schools scored proficient in reading on the National Assessment of Educational Progress in 2013. According to the Institute for Justice, which represented voucher parents in the case, five of six low-income students fail the state’s end-of-grade math or reading tests.