This is the 12560th most frequent Russian word.
коммунистов
"Communists" – plural form referring to members or supporters of communism.
In this sentence, 'коммунистов' is the plural genitive case of 'коммунист', used here to refer to a group belonging to the ideological group.
Я видел группу коммунистов, которые обсуждали социальные реформы.
I saw a group of communists discussing social reforms.
Here, 'коммунистов' is used in the genitive case showing the topic or subject of the book, referring to individuals of a specific political ideology.
Книга о коммунистов лежала на столе.
The book about the communists was lying on the table.
In this example, 'коммунистов' is utilized in the genitive case, denoting possession or relation to the ideas held by communists.