I READ PLENTY of articles, short and long, on all sorts of topics, but — I hesitate to mention this to ATC readers — I rarely read full length nonfiction books. But those by Michael A. Lebowitz, including his recent The Socialist Imperative: From Gotha to Now (Monthly Review Press, 2015), have been an easy exception. It is a pleasure and a relief to read theory that has such practical application to the questions socialists must address in our work to transform the world.