Black Baron, White Army oh wait, You already added it nevermind

Here's some American communist folk music that I believe should be added:
Spanish Civil War Song, by Phil Ochs
Hallelujah, I'm a Bum!, by Utah Phillips
There is Power in a Union, by Utah Phillips
All Used Up, by Utah Phillips
Bread and Roses, by Judy Collins
Knock on the Door, by Phil Ochs
Tear the Fascists Down, by Woody Guthrie
Union Maid, by Pete Seeger
If I Had a Hammer, by Pete Seeger
Solidarity Forever, by Pete Seeger
Which Side are You On?, by Pete Seeger

bella ciao and a las baricadas

over 100 songs on my youtube playlists
Soviet Union
https://www.youtube.com/playlist?list=PLjEh4zVgTccSDow1iC4qJW6sudLq_DUG7
Germany (There is both communist and fascist music, but you should see communist music)
https://www.youtube.com/playlist?list=PLjEh4zVgTccTg9WiavP7nxhI58rfg27s-
and for Poland I recommend Polish "Warszawianka" (Varshavianka) from 1905

socialist world republic
Through the Valleys and over the Hills

Kalinka would be pretty good.

You should definitely add:
Brüder zur Sonne zur Freiheit
Einheitsfrontlied
Solidaritätslied
Was wollen wir trtinken
Katyusha

Der offene Aufmarsch

is comming in next update! together with 1.5

Song of the Allies (aka March of the Warsaw Pact)

Arstotzka orchestrated theme?

Ahahahaha

if suggestions are still available, i heard "Pesnya o Trevozhnoy Molodosti" (Песня о тревожной молодости) was pretty good

''Ay Carmela'' and ''The Battle Goes Again'' please!

Black eyed cossack girl please, thank you!