

https://www.journals.uchicago.edu/doi/10.1086/253301 Centralized labour programs were enforced work on the civilian population to rapidly industrialize and catch up to Western nations in the 1930s. Since the labour was compulsory from the government, it is a forced labour program.
https://www.academia.edu/11885029 Ethnic minorities within the Soviet Union were forced into sparcely populated areas in the interior for forced labour, mostly mining. At least 6 million people were affected by this.
https://soviethistory.msu.edu/1921-2/militarization-of-labor/ Civilians were drafted into labour armies, forced work in remote locations, in order to rapidly industrialize. The labour armies would also oversee other forced labour programs.
On your last point, the US currently has 1.8 million incarcerated people. In 1931, there were 2 million in gulags, and more in other forms of incarceration. Please lick the boots of a different country.
You idiot, reread the sources, 1930-1938 is not wartime. Nor is 1931 the eve of WW2. Literally none of those are wartime measures. If you actually read the sources you would have also seen the programs went until the 1960s, after WW2.