A lot of the sci-fi films of the 50s had a anti-communist undertone. Consider “Invasion of the Body Snatchers”. One the aliens infiltrate society they can literally be anyone. Your neighbor, your best friend, your own wife might be working to destroy the American way of life. This can (and has been) viewed as an allegory to the commies among us, and how they can seem normal and friendly but can be a deadly enemy, even worse than one in uniform manning a tank over there somewhere. Of course now Hollywood would depict them as elevating mankind somehow. Because ... well don’t get me started on Hollywood’s politics.
Of course, liberals now claim that Invasion of the Body Snatchers was a warning against 50’s suburban conformity & social lockstep that elected Eisenhower & later Nixon.
The Pod People were the Silent Majority of their time, you see.
;^)