In the aftermath of a financial crisis marked by bank-friendly bailouts and loosening campaign finance restrictions, a chorus of critics warns that business leaders have too much influence over American politics. Mark Mizruchi worries about the ways they exert too little. The Fracturing of the American Corporate Elite advances the surprising argument that American CEOs, seemingly more powerful today than ever, have abrogated the key leadership role they once played in addressing national challenges, with grave consequences for American society.

Following World War II, American...