Propaganda cards are to be found in the Propaganda deck, whitch are to be located on the left side of jail. These cards are used on yourself or other players depending on the cards. They can be drawn from the propaganda deck on a players turn for 2 actions, these cards are then placed in the players hand, and you may save them to later if you like to.
Its free to use a bought Propaganda card, and you may do so at any time (not only on your turn).
You dont have to show any player your Propaganda cards before you use them if you dont whant to.
When Propaganda cards are used they are placed in the discard pile.When the Propaganda deck is empty, shuffle the discard pile and place all the cards from it face down in the Propaganda deck.