Crocker was one of several critics of the New Deal and of Franklin D. Roosevelt's foreign policy. Crocker was one of seven judges in the largest and longest Army court-martial of World War II, described in the book On American Soil, by Jack Hamann.

Crocker was the author of Roosevelt's Road to Russia, published by Henry Regnery Company (1959). Ignored by the New York/Washington establishment it garnered favorable reviews in the National Review, Modern Age, The Chicago Tribune and The Boston Herald. In it, Crocker made claims that Roosevelt invariably backed Stalin and went to great lengths to hide this from the American public.