“America will never be a socialist country,” President Trump said as he launched his bid for re-election last week.

That declaration was an effort to frighten Americans and undermine growing support for expanding Medicare and Social Security—two popular programs that have long been derided as “socialist.” Mr. Trump’s declaration hypocritically ignores that he and his Republican colleagues are the nation’s leading purveyors of an insidious form of corporate socialism, which uses government power and taxpayer resources to enrich...