In this catalogue the term "stamp" should be interpreted broadly to include, among other things, any label designed and issued for use in payment of postal, revenue or related charges.
Several present day postal administrations have sold their stamp issuing activities to agencies who have abused their right to design, print and distribute stamps. It is not our role to pass judgement on these activities, but we need to make note of those judgements that have been made by others when we deal with these issues.
Other stamps were issued by governments in exile, pressure groups, political parties and organizations. These stamps are often, but not always, propaganda labels that were never actually used to pay for postal charges. It is important to document these and the numerous forgeries that have been produced over the years so that a collector who encounters this material will know exactly what he has.