A key bit buried in the wiki article:
Persons of Jewish origin were over-represented in the Russian revolutionaries leadership. However, most of them were hostile to traditional Jewish culture and Jewish political parties, and were loyal to the Communist Party's atheism and proletarian internationalism, and committed to stamp out any sign of "Jewish cultural particularism".Russian author Solzhenitsyn noted: "But it is impossible to find the answer to the eternal question: who is to be blamed, who led us to our death? To explain the actions of the Kiev cheka [secret police] only by the fact that two thirds were Jews, is certainly incorrect."Counter-revolutionary groups, including the Black Hundreds, opposed the Revolution with violent attacks on socialists and pogroms against Jews. There was also a backlash from the conservative elements of society, notably in spasmodic anti-Jewish attacks – around five hundred were killed in a single day in Odessa. Nicholas II of Russia himself claimed that 90% of revolutionaries were Jews.
For better or worse, the Ukrainian perception was that Jews were heavily involved in the Communist Party and the secret police, and so blamed them for the atrocities that the Communists inflicted.