actual sources seem to disagree with you
Robertson drew attention to one of the great scandals of American life. “Mass incarceration on a scale almost unexampled in human history is a fundamental fact of our country today,” writes the New Yorker’s Adam Gopnik. “Over all, there are now more people under ‘correctional supervision’ in America–more than 6 million–than were in the Gulag Archipelago under Stalin at its height.”
https://www.newyorker.com/magazine/2012/01/30/the-caging-of-america
I only counted those incarcerated. You’re counting community service, probation, parole, etc. And my sources are The Guardian and this academic journal.
That’s just splitting hairs, but even going with your numbers, it’s clearly comparable to the time of peak incarcerations in USSR. So, if we look at how the systems evolve over time, USSR incarceration rate dropped, while US incarceration rate continues to climb.
USSR having double of course isn’t comparable, and the US prison rate has been going down (well, at least until 2019, after which we got COVID and prison rates saw a gigantic dip that has been climbing bit by bit since, but still lower than 2019).
And no, it’s not just splitting hairs. There’s a difference between being constantly surveiled and watched by the state, temporarily (at least nominally); and getting locked up in a festering environment where they neglect your good feeding and, in the USSR’s case, your well-being and being forced to labor, with a much stronger KGB.