We are publishing for the first time since 1944, this foundational document of the Marxist Workers Group (GOM). Written in 1943 by a young Nahuel Moreno, barely 19 years old. Polemising against Liborio Justo (Quebracho), Moreno proposes to move away from the circles and debates of intellectuals that predominated in Trotskyism. Its central axis is to connect with the workers' movement and its struggles. Thus, with a handful of young people, he began to take the first steps in the construction of a revolutionary party, following the guidance of Lenin in his book What is to be done?