
“Karl Marx; the great enemy of human freedom.”
As quoted in "What Would Lincoln Think?" http://listenonrepeat.com/watch/?v=knpGZGYLrRM#What_Would_Lincoln_Think__Harry_Jaffa_on_The_American_Mind (20 February 2014), by Charles Kesler, The Claremont Institute
2010s, Interview with Charles Kesler (2014)