But I hesitate to call them trolls, and here's why. Most average Americans were rooting for Stalin to kick Nazi butt in WW II. Many of those folks (non-reds) advanced a picture of Stalin as kindly old pipe-smoking Uncle Joe.
Were those folks back in WWII Stalinist trolls? No, I see them more as people who simply did not want to see the full picture. Or people who felt Stalin's good outweighed his bad(!). But not trolls.
Just my two cents.
That being said, not everyone expressing pro-Putin sentiment here is a troll, but it's sad to watch the trolls play the oblivious for suckers.