Sentence:  In answering these questions , we need to ask not merely whether Communist troops have crossed over into territories they did not occupy before , and not merely whether disciplined agents of the Cominform <WSD>are</WSD> in control of governments from which they were formerly excluded : 
Meaning of the word marked with <WSD> tags:  have the quality of being; (copula, used with an adjective or a predicate noun)