Behind the onslaught is a well-funded network of conservative think tanks that you've probably never heard of. Conceived by the same conservative ideologues who helped found the Heritage Foundation, the State Policy Network (SPN) is a little-known umbrella group with deep ties to the national conservative movement. Its mission is simple: to back a constellation of state-level think tanks loosely modeled after Heritage that promote free-market principles and rail against unions, regulation, and tax increases. By blasting out policy recommendations and shaping lawmakers' positions through briefings and private meetings, these think tanks cultivate cozy relationships with GOP politicians.