Check out the Wikipedia entry for this organization. But here are some highlights from the Wikipedia entry for your information. They are the group organizing the town hall health care reform protests.
"In 2003, an internal rift between Citizens for a Sound Economy (CSE) and its affiliated Citizens for a Sound Economy Foundation led to a split in which the latter organization was renamed as a separate organization, called Americans for Prosperity."
"Its foundation's chair and founder is David Koch of Koch Industries, which runs oil refining and pipeline companies. Another Americans for Prosperity Foundation board member is Richard Fink, a Koch executive who serves as a director of the refining subsidiary. Fink helps control AFP's purse strings. He is president of the Koch-affiliated Claude R. Lambe Charitable Foundation, which gave AFP's foundation $2.2 million from 2005-06, according to the Foundation Center."
"On February 27, 2009, in collaboration with others, the organization sponsored a Dallas-Fort Worth, Texas and Washington, D.C. Tea party protest."
"Americans for Prosperity is led by Tim Phillips, who was a former partner with Ralph Reed's Century Strategies. That organization became well-known when it was revealed in a Senate investigation that convicted lobbyist Jack Abramoff was laundering money through Century Strategies and Americans for Tax Reform to oppose legislation that his Indian tribe clients wanted to defeat."