Sentence:  One cannot but wonder whether these doubts about the success of Khrushchev 's agricultural policy have not at least something to do with one of the big surprises provided by this Congress - the obsessive <WSD>harping</WSD> on the crimes and misdeeds of the `` anti-party group '' - Molotov , Malenkov , Kaganovich and others - including the eighty-year-old Marshal Voroshilov . 
Meaning of the word marked with <WSD> tags:  come back to