The prominent Trotskyist thinker and revolutionary Daniel Bensaïd wrote: “The left suffers from a painful memory. General amnesia. Too many bitter pills swallowed, too many broken promises. Too many issues buried, too many skeletons in the closet.” The history of dissident movements within communism is one such forgotten subject. (...) Compared to the impressive volume of historiography on the Chilean Communist Party, socialism, the MIR (Movement of the Revolutionary Left), and other left-wing currents, Trotskyism has not yet received adequate attention. This deficiency largely motivated the authors of these pages to undertake this work and attempt a “history of Chilean Trotskyism,” fully aware of all the difficulties and potential gaps due to the scarcity of sources. Always starting from Antonio Gramsci's thesis and trying to fulfill it, we assume that the history of any political party or movement is first and foremost the history of a social group, and, therefore, is a way of writing the general history of a country.”