World Without End (1956)
The astronauts represent the United States and the US military in particular. Although they are primarily scientists, explorers, and engineers, they are also right wing conservative war hawks who dress in army/military style uniforms and carry weapons as opposed to having uniforms and equipment designed to assist in space travel and exploration.
Moires represents the weak, liberal, leftist "Pinko" who through deceit and propaganda spreads the fear that the astronauts are only interested in taking over and enslaving them and thereby endangers his own people because of his cowardice and unwillingness to fight.
The ugly mutates represent the spread of Communism, as Deena says only the ugly mutates fight and are the masters who are in charge and make slaves of their own people.
The leader of the mutates represents all Communist leaders since it's said that he is selected as leader by killing all of his rivals, ala Joseph Stalin and Mao Zedong, and that he only stays in power until the new leader kills him. Both Stalin and Mao stayed in power until their death.
The astronauts say they are there to help the people and that the people need to manufacture and have weapons so as to secure food, water, and building materials so they can establish their own autonomous outside land area and then encircle their land so as to ensure the survival of their people and future generations. Echoing why Americans claimed they were in and what they wanted for Korea and later the people of Vietnam.
Once the mutate leader is killed and the other mutates (Communists) are driven out, the remaining "normal" children are then indoctrinated in the "American" English language, culture, and customs.
The astronauts final grand solution to the mutate problem faced by the people is for the people to arm themselves, face the mutates with greater violence, and ultimately go to war with them. This is the best and most effective solution to the mutate problem the astronauts present to the people, and the "only way" to ensure peace and the continuation of their better way of life.