“Papers please!”
Sorry this is the Gestapo or KGB speaking.
If they are illegal, deport them, if they are legal give them papers. Easy.
pleni, dont go their with me on this, I've been there and seen there. You go talk with your albanian buds, ask for their Serbian citizenship papers.
Here in the US, we also have "papers" but in difft form. SocSecCard, Driv Licence etc...you need documents to obtain them..i.e "papers".