As the fourth season of “Veep” came to an end, director Armando Iannucci turned from chronicling the foibles of cynical western democracy to something darker still: life under dictatorship.  He found his source material in the French graphic novel “The Death of Stalin.” David Remnick compares Iannucci’s new film to “Get Out”—a real horror story that is also a comedy of terror. “I wanted to take myself out of my comfort zone by taking on these themes that involved death, destruction, and paranoia,” Iannucci tells him. As the brutal dictatorships of the twentieth century fade into history, Iannucci wants to remind people—especially those frustrated with democracy—just how horrific totalitarianism really is.