https://en.m.wikipedia.org/wiki/Julius_and_Ethel_Rosenberg
https://en.m.wikipedia.org/wiki/Theodore_Hall
https://en.m.wikipedia.org/wiki/George_Koval
https://en.m.wikipedia.org/wiki/Harry_Gold
https://en.m.wikipedia.org/wiki/Klaus_Fuchs
https://en.m.wikipedia.org/wiki/Harold_Glasser
https://en.m.wikipedia.org/wiki/Harry_Dexter_White
https://en.m.wikipedia.org/wiki/Nathan_Gregory_Silvermaster
There were many, many people in the US who betrayed their country to the Soviets because they believed in Communism.
https://en.m.wikipedia.org/wiki/Soviet_espionage_in_the_Unit...
The Rosenbergs were known as believers in Communism.
Even Oppenheimer, who was a stance Anti-Stalinist and the liberal under the fascist security clique, had the very same view and motivation. Just from the far right.
https://www.osti.gov/opennet/manhattan-project-history/Event... names many more.
To this day it is in our best interests to root out and discourage communists and adjacent from participating in our republic. Anything less undermines our natural rights to life, liberty, and the pursuit of happiness.