As much as an entertainment film can be, "The Front" is about what it was like when to be a member of the Communist Party, or to have been a member at some earlier time, or to have associated with people who might have been members, or to have had left-wing sympathies, or to have been sympathetic to people who might have had such sympathies, was enough to destroy one's career, to turn old friends into stool pigeons, to humiliate the codes by which men professed to live morally.