It does not detail those facts. I gloss over them in my reading of the article because I think the topic is been well covered elsewhere. For example, the Oppenheimer movie did a fair job of depicting the communist party activities among intellectuals in the late 1930s.

The fact that those activities led to a thing called McCarthism in the early 1950s is pretty well documented.

Imprisoning Qian for 5 years for a meeting in the late 1930s after his contributions to the war effort was very Red Scare consistent.