The International brigades had no russian soldiers, only some specialists for the instruction of the young soldiers.I have made a conference in 2016 about the nine brigadists of Choisy le Roi killed in Spain.
-5 members of the PCF,workers in the manufactures of Vitry.
-3 anarchists,workers in a printing house.
I have not the impression that they were "red terrorists".
First.. they were Soviets.. not Russians! they were organized and controlled by Stalin´s socialists... by the Komitern.. not by any "freedom".. but we can see what kind of "freedom" loves Preston.
Second. The Anarchist didn´t fight in International Brigades ... I say again.. a Stalin´s Force in Spain.. Anarchists tried and organized their own "international".. and it was a disaster.
Who told about terrorism.. they were Stalin´s soldiers fought by Stalin on behalf of Stalin.. but some of them were terrorist... of course... I remember the French Marty....André Marty, the terrorist and killer (Le boucher de Albacete).... appointed by Stalin as General Inspector of the International Brigade.. a Psyco killer... the man said the price of a man is 75 centimes....the price of a bullet....(Preston for sure would define as a Pacific democratic man). Other Pycho Killer was Karol Swierczewski, only a insane mind as Preston´s one would say that those gangs of Stalinist in Spain they were "volunteers of Freedom"....)