William J. Chase received his BA from Lafayette College and PhD from Boston College. He taught at the University of Pittsburgh from 1979 to 2019. His research and publications have focused on social and labor history, political prosopography based on statistical analysis, political repression in the USSR, microhistory, and Communist movements in Spain and Mexico. Olga Novikova-Monterde is an independent researcher specializing in political thought, political emotions, revolutionary tradition, and Marxist feminism of Russia. She has published several books in Spanish on the history of Russian political thought as well as numerous articles in Spanish, Russian, French, English, and German.