Sentence:  The widespread purge that has taken place the past twelve months or so among Communist leaders in the provinces gives assurance that the party officials who will <WSD>dominate</WSD> the Congress , and the Central Committee it will elect , will all have passed the tightest possible Khrushchev screening , both for loyalty to him and for competence and performance on the job . 
Meaning of the word marked with <WSD> tags:  be in control