On March 13, 1940 in London, as the audience was beginning to filter out at the end of a lecture in a location called Caxton Hall, an impeccably dressed man who had quietly slipped in late to take a seat in the front took out a revolver, strode toward the lectern, and shot the lecturer, Michael O’Dwyer, twice in the heart, killing him instantly, but also wounding several others non-fatally. The assassin, Udham Singh, made no attempt to escape, and when he was tried some weeks later, he explained what he had done very clearly by saying “He wanted to crush the spirit of my people, so I have crushed him. For full 21 years I have been trying to wreak vengeance. I am happy that I have done the…