The man often called the father of Ukraine’s revolution, Mustafa Nayyem, has seen up close the way the hopes of young, passionate reformers can be thwarted by the forces of an old and corrupt system—a dilemma that faces movements for change across the world right now. And Nayyem is angry. In Ukraine he sees the past slithering back into the present like the many-headed hydra of old, lethal to some and poisoning the atmosphere all around.