The communism skill tree has two recipes that require a hammer and sickle. You start with one of both, and you can craft a hammer with Smithing, but there is no recipe for sickles-- you can only find them. What's up with that? It kind of sucks because the player is forced to rely on the RNG to find an extra sickle in the first couple of floors, and since those floors are the most densely populated in terms of item variety, it is fairly unlikely.
Hammer is craftable because non-Commies are intended to have access to the Atom Smasher. Sickle is not because non-Commies aren't intended to have access to Power Ushenka/Armor.
But Soviet Russia should provide me with every sickle I need for bringing her information on evil capitalist skills!