During the interwar period, Mušicki served as an aide to King Alexander and Queen Maria. He joined the fascist Yugoslav National Movement (, Jugoslovenski narodni pokret, Zbor) following the king's assassination in 1934.
During the interwar period, Mušicki served as an advisor to King Alexander and Queen Maria. He later joined the Yugoslav National Movement (Jugoslovenski narodni pokret, Zbor) following the king's assassination in 1934.