Reds is both an accurate and a possibly misleading title. It's accurate because the two leading characters devote much of what we see of their lives to Communist activities. It's possibly misleading because the focus is on the people, not the activities. This is not, in essence or intent, a political work; it is biographical. Solanas's Hour of the Furnaces, Pontecorvo's Battle of Algiers, Wajda's Man of Marble are political films, which posit and explore political questions, then strongly support particular action about them: Reds is a patently different order of work.
Bonnie and Clyde Warner Brothers "I have a bad memory for facts," Stendhal once wrote, and Flaubert said later that "everything the artist invents is true." I don't mean to imply that Arthur Penn, the director of Bonnie and Clyde, or Robert Benton and David Newman, its writers, have anything like that kind of stature, but the principles hold up.