NEWYou can now listen to Fox News articles! Philadelphia parents noticed troubling signs in their children’s social studies curriculum and asked to see all the materials. They couldn’t get them.Now those materials have been brought to light in a congressional investigation. A new majority staff report from the House Education and Workforce Committee documents how a small group of school personnel turned Philadelphia’s social studies curriculum into a political platform for extremist causes.When those parents approached my organization, the North American Values Institute (NAVI), asking for help, we tried to find out what the district was teaching but we also…