Trotskyism disagrees with Marxism-Leninism on a number of important theoretical points. These disagreements aren’t limited to the field of theory but have a real practical impact on the movements of working class and oppressed peoples. In our day-to-day struggles, we see them come up again and again. Practically, the question of the united front illustrates very clearly the glaring difference between Marxism-Leninism and Trotskyism. This is a question of extreme theoretical importance, with tremendous practical consequences, so we should examine it closely.