The clenched fist "protecting the friend, fighting off the enemy" (German: „schützend den Freund, abwehrend den Feind“) was the symbol of the RFB,[10][11][12][13] used on all its insignia, and its registered trademark since 1 March 1926. In May 1926, during a flag parade, activists used it as a sign of rallying to the movement and as an oath to defend the USSR.[citation needed]