Gustav Bokis, for instance, headed the mechanized forces of the Red Army, Jukums Vācietis served for a while as commander-in-chief, and Jēkabs Alksnis commanded the air force. Having played a key role in the Lockhart affair, Eduards Bērziņš was instrumental in setting up the Gulag system, while his namesake Jānis Bērziņš (real name Pēteris Ķuzis) was the creator and director of Soviet military intelligence.
Militant atheist Latvians (a tiny Baltic nation):
https://www.rbth.com/history/331104-how-latvians-defended-communism