Commentary Sunday night I watched “Life, Liberty, and Levin” on television. My long-time friend and former colleague Paul Kengor was one of Mark Levin’s guests. The focus of the show was Levin’s new book, “American Marxism.” Kengor is a leading Cold War historian, an expert on Marxism, and a prolific author. The brilliant pair discussed how ubiquitous and ferociously aggressive Marxism is in today’s America. What we’re witnessing is the culmination of trends that have been in place for at least a century. My first book—”America’s March Toward Communism” (Libertarian Press, Inc., 1987)—reviewed the great extent to which most of the principles contained in Karl Marx’s ten-point platform for how to socialize an economy (spelled out in “The Communist Manifesto”) had been adopted as official policy in the United States. While I have had readers in the decades since the ’80s express amazement at how I saw the patterns “way …