voter registry

i.e name, address, party affiliations, etc..., and whether or not they voted (but the vote itself are secret)

You need to be on the list to vote in elections. You get assigned the closest polling place, then you show up, they ask for you name, and they go through the book thing with a list of voters assgined to that polling place, they find your name then check it of before getting someone to set up the voting machine thing for you. For Pennsylvania, they ask for ID for the first time, they mail you a voter registry card which can be used for as that ID. Next time you don't need an ID, the just ask you for a signature on the voter roll.

If you name isn't on the voter roll at the polling station for some reason (like a mistake they made), you can ask for a privisional ballot then they sort it out later. If you were supposed to be on there, then they count the vote, otherwise its discarded.

So once they have this list, they can just go down the list of democrats and raid every house