A trillion-dollar industry, the US non-profit sector is one of the world's largest economies. From art museums and university hospitals to think tanks and church charities, over 1.5 million organizations of staggering diversity share the tax-exempt 501(c)(3) designation, if little else. Many social justice organizations have joined this world, often blunting political goals to satisfy government and foundation mandates. But even as funding shrinks, many activists often find it difficult to imagine movement-building o