Гулаг (gulag) is the acronym for "Гла́вное управле́ние исправи́тельно-трудовы́х лагере́й" which translates to "Head management office of correctional work camps". And if you're going to go for all incarcerated, the number is actually somewhere in the 2.1mil range in the US, because hey, jails are a thing.
Oh please, the United States is so incredibly armed, my death will likely come at the hands of some misplaced right-wing militarized fascist group performing mass murders under the guise of "Freedom" and "A return to the constitutional purity of the US".
I've been promised that that was going to happen any day now since the wrong person got elected back in 2000. Nearly a quarter century on I am beginning to suspect that somebody was overstating something, I can't quite put my finger on what though...
The US currently has about 1.2M people in their gulags, comrade*