History has shown that small revolutionary organizations will face not only the stern test of wars and repression, but also potentially shattering opportunities that emerge unexpectedly when strikes and social struggles explode. As that happens, communist parties not only recruit. They also fuse with other workers organizations and grow into mass proletarian parties contesting to lead workers and farmers to power. This assumes that well beforehand their cadres have absorbed a world communist program and strategy, are proletarian in life and work, derive deep satisfaction fromhave fundoing politics, and have forged a leadership with an acute sense of what to do next. Their Trotsky and Ours is about building such a party.