In the battle to defend free markets, it is not always easy to know who your friends and enemies are. In "Unstoppable," Ralph Nader argues that there are in fact surprising areas of convergence between the left and the right in the battle against corporate statism. Convergence, he believes, is especially needed now: Statist forces have grown dramatically in recent years, pushing for massive bailouts of financial institutions and taxpayer subsidies to major corporations.

Mr. Nader, the consumer crusader who ran for...