Radical leftist students sometimes occupy a university building, then refuse to leave. Or they glue their hands to a road in order to stop traffic. It’s their way of making a statement against this or that societal phenomenon that they perceive as fascist or bourgeois, etc. Such as people trying to get to work on time.

But these and many other radical leftist tactics come from a single author. His name was Gene Sharp. In his book From Dictatorship to Democracy, Sharp listed around 200 nonviolent ...