Pedzisa mutsara unotevera: Muna July 1940, Roller, achangopukunyuka kusungwazve nezviremera zveRomania, akaenda kuBessarabia, iyo yakanga yave
ichangobva kutorwa nemaSoviet. Akanga ari kwenguva yakati paReni, muUkraine SSR. Roller akazotamira kuMoldova SSR, kuChișinău, kwaakatanga kushandira Guta reTobacco Plant. Muna June 1941, mazuva mashomanana Operation Barbarossa isati yatanga, akatumira tsamba yake kuna Boris Stefanov, achikumbira kuti afungisiswe kuti ave nhengo yeCommunist Party yeSoviet Union. Akwezvwa muboka rePCdR muMoscow, Roller akaramba achishanda pasi paPauker, uyo akanga abatanawo nenzanga yevatorwa vokuRomania. Akadzidzawo pachikoro cheHistory paMoscow State University. Chinhu chiduku chinozivikanwa pamusoro pebasa raRoller mukuvamba kwa 1944, apo chinjo yemhanza paEastern Front yakaratidza kukunda kweSoviet pamusoro peAxis Powers. Zvinonzi, akarega kubhadhara mari yake yePCdR, izvo zvinogona kuratidza kuti aive akabatikana nebasa rebato, uye akagadzirira basa muCommunist Romania. Mushure mekupedza nguva yakati kuInstitute No. 205 (yaimbova chikoro cheComintern), muna Zvita 1944 ndiye chete chizvarwa cheRomania chaidzidzisa vasungwa vehondo kuCentral Antifascist School yeKrasnogorsk. Ari pano, akakarakadza kushandisa Alexandru Bârlădeanu naHaia Grinberg kuti vamubatsire nemakirasi akasarudzika.