At the start of the quest Talent Pool, Tommy Torini will ask you to recruit some new acts for The Tops. He will give you four business cards, that you must give to four different people. They are a quest item and cannot be dropped or placed in a container, they are removed from your inventory when the acts accept your offer to work at The Tops.
They must be given to:
If any of the acts are killed before handing out all the cards, the quest will fail and you will be unable to remove the objects from your inventory.