Page 151 has what you're looking for:

The reality was, of course, that Russian and later Soviet imperial rule was at least as brutal as that of other imperial powers. In their campaigns of Russification the Tsars imprisoned and exiled Finns, Ukrainians, and others who dared to practise their national language and sustain a national culture. The Communists continued the practice even more brutally under the guise of eradicating ‘bourgeois nationalism’. Large numbers of intellectuals, especially in Ukraine and the Baltic States, were killed or exiled by Stalin. Under his successors the executions were fewer but the pressures continued. Communist Parties, with their own local First Secretaries, existed in all the fifteen constituent republics of the Union save for Russia itself. Russians saw this as discrimination. In fact it was a sign that the Russians did not need their own party, since they dominated the Communist Party of the Soviet Union and exercised effective central control over the republican parties. Throughout the Soviet period discontent flared up from time to time in one or other of the constituent republics, and was brutally suppressed.

Tsarist Russia started with the russification process. The Soviets initially under Lenin reversed course, but this later changed under Stalin, Khrushchev and Brezhnev. They accelerated the process. None of this is contradictory to what I've said.

The pogroms in tsarist Russia are horrible acts of genocide, but they were fairly simply anti-Jewish in nature. They were not a part of the russification process and should be considered separate. Hence when I compare the russification between tsarist Russia and the Soviet Union, I'm obviously not taking any pogroms into consideration. It's horrible, but unrelated to the subject at hand.