Over the past two and a half years a major debate has developed about anti-Semitism in the British Labour party. Jeremy Corbyn, the party leader, is a supporter of murderous and even genocidal terrorists and is a supporter of Holocaust deniers and distorters. He is furthermore an anti-Israel inciter and part-time anti-Semite. Many insights can be gleaned from the Labour anti-Semitism debate, and several are crucially important to the UK and the Western world at large.