Mitt Romney's candidacy is subjecting the entire private-equity industry—where Mr. Romney spent most of his business career—to vicious attacks by journalists and several of his rivals for the Republican presidential nomination.

Newt Gingrich's political action committee is sponsoring a film called "When Mitt Romney Came to Town" that accuses Mr. Romney and his former company, Bain Capital, of taking over companies, looting them, and then tossing their workers out on the street. Jon Huntsman's attacks on his rival include the description of private equity as a business that "breaks down businesses [and] destroys jobs, as opposed to creating jobs and opportunity, leveraging up, spinning off, [and] enriching shareholders."

This is anticapitalist claptrap. Private-equity firms make significant investments in companies, mainly U.S. companies. Most of their investments are in companies that underperform industry peers. Frequently these firms are on the brink of failure.

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