Four monkey men fight Flash Gordon in the Flash Gordon (comic strip). Flash, stripped to his underwear, beats all 4 with his bare hands in a matter of moments. The monkey men are reddish-orange, and wear shorts.
Three monkey men fight Flash in the arena in Ming's palace in Chapter 101: The Planet of Peril of the "Flash Gordon (serial)" serial. The monkey men look more or less like human wrestlers, but they make funny faces, and 2 out of 3 of them have fangs. They don't win. 2 of the 3 were performed by wrestlers Bull Montana and Constantine Romanoff.