Think Progress:
"Citizens for a Sound Economy — which has also received funds from private health insurers in the past and played a critical astroturf role in killing reform under Clinton — eventually split, with one wing forming Americans for Prosperity in 2003, and another forming FreedomWorks in 2004. Both organizations, which are still funded by the Koch Industries empire, were instrumental in organizing the anti-Obama tea party protests, and have been spreading misinformation and anger at the current health reform effort. Americans for Prosperity’s anti-health reform front group, Patients United, has hosted speakers comparing the House health reform bill to the Holocaust. "
