Remember Hollywood’s old obsession with the “blacklisting” of alleged communists? Movie after movie captured that dark chapter in American history, each film wagging a cinematic finger at industry insiders who punished Communist sympathizers — or just folks suspected of harboring such thoughts. Think “The Front,” “The Majestic,” “Trumbo,” “Guilty by Suspicion” and “Good Night, and Good Luck.” That was then. Today, people who hold what the Hollywood elite consider untenable views — such as those who believe in protecting the U.S. border — are targeted, shamed and made to fear for their careers. It’s happening both inside Tinsel Town and...