These stamped notes replaced unstamped Soviet and Russian notes at par. Governments enforce the payment of the tax by making unstamped documents unenforcable in court. Despite heavy penalties imposed on owners of unstamped books, many books were concealed and unstamped. Harney was imprisoned three times for selling this unstamped newspaper. Countries such as New Zealand, Zimbabwe and Ireland, have printed unstamped aerograms. Both were prosecuted, thus commencing the War of the Unstamped. A central figure of this "war of the unstamped" was Henry Hetherington. The "war of the unstamped" saw nearly 800 people imprisoned. However, some countries such as New Zealand, Zimbabwe and Ireland, sell unstamped aerograms. Letters to other countries had to be paid for in cash and unstamped. His unstamped paper, "The Poor Man's Guardian", was launched in 1831.