Is that even legal under US law? Apparently it is in some states. Federal law does not, apparently, prohibit political discrimination. But some states do - California, New York, DC, Colorado, and North Dakota.[1]
This should be reported to the FBI's Foreign Influence Task Force.[2] Anyone involved in such suppression activities may be considered an "unregistered foreign agent".[3] Anyone or any organization attempting to influence US policy on behalf of a foreign government is supposed to register. Here's the database.[4]
[1] https://www.legalmatch.com/law-library/article/political-aff...
[2] https://www.fbi.gov/investigate/counterintelligence/foreign-...
[3] https://en.wikipedia.org/wiki/Foreign_Agents_Registration_Ac...
[4] https://search.justice.gov/search?affiliate=justice_fara
I see this as a reason to strengthen the Foreign Agents Registration Act.