This is the 2568th most frequent Russian word.
советские
"Советские" means "Soviets" or "Soviet" (relating to the Soviet Union).
Here, "советские" is used as an adjective to describe films that originate from the Soviet Union, highlighting cultural production.
Советские фильмы часто имели глубокое содержание.
Soviet movies often had deep content.
In this sentence, "советские" modifies "люди" as an adjective, referring to people from the Soviet Union, emphasizing their societal identity.
Многие советские люди верили в светлое будущее.
Many Soviet people believed in a bright future.
The word "советские" describes scientists who were associated with the Soviet Union, focusing on their affiliation and accomplishments.