John Baumbach

“Some forty other Tea Party and antitax groups also clamored for all-out war. Among the most vociferous was the Club for Growth, a small, single-minded, Wall Street–founded group powerful for one reason: it had the cash to mount primary challenges against Republicans who didn’t hew to its uncompromising line. The club had developed the use of fratricide as a tactic to keep officeholders in line after becoming frustrated that many candidates it backed became more moderate in office. It discovered that all it had to do was threaten a primary challenge, and “they start wetting their pants,” one founder joked. Its top funders included many in the Koch network, including the billionaire hedge fund managers Robert Mercer and Paul Singer and the private equity tycoon John Childs.”
― Jane Mayer, Dark Money: The Hidden History of the Billionaires Behind the Rise of the Radical Right