By Arianna Prothero
Education Week
September 18, 2014
Unions have struggled to gain traction in the fast-growing charter sector. As the number of charter schools has grown nationally, the number of unionized staff members has shrunk according to the most recent data from the Center for Education Reform.
Only about 7 percent of charter schools were unionized in 2012, down from 12 percent in 2009, according to a 2014 annual survey by CER, a Washington-based research and advocacy group.