Abstract
The investigations performed by José C. Valadés regarding the arrival and practice of socialist ideas in México, which influenced the workers movements near the end of the 19th Century and the beginning of the 20th Century have been set aside, since his works about the 1910 Mexican revolution and those regarding the Juárez stage have been more divulged. This article offers biographical information of Valadés with the purpose of highlighting his participation in the journalistic and political life in Mexico; his researches relating to anarchy are supported on direct sources of information, since the historian was an activist linked to those social movements and besides, he was able to rescue files from worker unions and valuable documents which have served as a starting point for the studies performed by other historians, both nationals and foreigners.