There's a difference between communism, Stalinism, and Maoism. Communism itself, does not have a death toll. Specific examples of communism, like Stalinism and Maoism, most certainly do. But, yeah, the hammer-and-sickle doesn't represent general communism, but rather Soviet-style communism, Stalinism. It's not something I'd be comfortable including in a gaming product.
But someone of Russian descent, for whom the hammer-and-sickle are as patriotic as the stars-and-stripes in the US? I'd hesitate to judge the positive use of the hammer-and-sickle as supportive of the worst aspects of Soviet communism.
I don't have all of the Uncaged books, but now I want to go back through the ones I do have looking for these items! You don't remember which volume they are in, do you?