Pacific Research Institute Pacificlegal ( Pacific Legal Foundation ) Palmetto Family Council Paraguayan Center for Promotion of Economic Freedom and Social Justice Parents in control Parlata Pennsylvania Family Institute Philosophe ( The Philosophe ) Phoenix Center Pioneer Institute Poderlimitado, Spain Policy Exchange Policy Research Initiative Polish American foundation Polish Ludwig von Mises Institute Politeia Politeia Political Economy Research Center Polyconomics PPE Prague Institute For National Security Privacyalert ( Privacy Alert ) Pro Libertate Progress & Freedom Foundation Promethea ( Promethean movement ) PRP ( Prudent Politics ) Public Choice Public Interest Institute Public Policy.org Public Service Research Foundation