There are so many comments bashing foreigners for pedantry or "how did you miss that one obvious answer?". But it's really about naming conventions. It didn't even occur to me to enter Nazi party the first time this happened to me on Jetpunk. The same with Communists, which in the case of the Soviet Union I'd only ever heard of as KpdSU (CPSU). We just say it that way in my country. And yes the CPSU are obviously Communists, but that's a larger alignment. You'd be surprised if "the Leftist party" was the only accepted answer for Labour, too.
Now this is an American website so it makes sense that the answer that pops up at the end matches American conventions. But if an alternative answer is both the technically correct one and commonly used by a sizable minority of Jetpunk's audience, it also makes sense to accept it.
Perhaps include the Liberal Party of Canada -- most successful political party of the 20th Century, in power more than the USSR Communist Party, and they didn't even cheat.
Please accept shorter versions of other parties like CPSU for Communist Party of the Soviet Union and Tories for the Conservative party in the UK. Will save time and be really convenient
Also, maybe Bolshevik should be accepted for the Party that ruled the USSR.