Many Russian sectarians aided, abetted, and supported the Bolsheviks.
The Bolshevik's weren't supported by sectarians because they thought Lenin was a good Xian, whatever that may have meant; he and his group were supported because the sectarians thought they'd have breathing space and enjoy greater rights or benefits under the Bolsheviks. It's an ahistorical insult to think they thought Lenin "righteous." It was simply a pragmatic move on their part. Even if many did say it was God's will to support the Bolshevik's.
Old Believers and various Protestant faiths had real troubles under the tsars. People pursue their interests as they see them; those are their only true interests if you value self-determination as a human right.
Few thought Cyrus (or "Koresh" to be a great righteous ruler in the fashion of Moses or David; but he let the Jews home go after conquering the Assyrians, and that counted for much. If you think you need some sort of Bible reference, that's one. Here's another. Even under the Romans the Jews had more freedoms than many people, and Paul, writing before the destruction of Jerusalem, saw that. One doesn't have to be a true believer and righteous, in other words, for God's people to benefit. When somebody's called a "righteous gentile," it doesn't mean they're pious and Torah-observant.
Of course, the Bolsheviks quickly treated the Old Believers worse than the tsars ever did. Then again, the Bolsheviks treated pretty much everybody worse than the tsars ever did.