I'm kind of confused as to what is being asked.... but this is my best answer.
SOCIAL Prejudice, (maybe legal if we talk about the consequence to his actions)
why it cant be the others--->
racial ---- they say nothing about race here.
(MAYBE) legal----- from the passage, we can say that the guy is richhhhh, and he might be able to wave off the consequences of his murder. but then again you only analyze this passage so, probably not
environmental---- they don't mention the environment....
THE REASON WHY IT SHOULD BE SOCIAL- their social standings in this situation
-diamond ring (if thats what they mean by diamond ring finger, it could mean something else as well) only the rich can afford, a cane too
- hotel society gathering... (rich)
-poor Hattie Carroll could be literal as well.
Answer:
It proves he was racist against Jewish people.
Explanation:
For Stalin, whose deeds easily matched those of Hitler and whose deceits had been evident throughout his life, the Doctors' Plot and intended show trial were meant to cleanse the Soviet Union of “foreign,” “cosmopolitan,” and “Zionist” (read Jewish) elements.