John Birch Society n (Government, Politics & Diplomacy) politics US a fanatical right-wing association organized along semisecret lines to fight Communism [C20: named after John Birch (killed by Chinese communists 1945), American USAF captain whom its members regarded as the first cold-war casualty]Collins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014