This article is the fourth in this Nationalities Papers series, following Part 1 which covered the period from the arrival of Gypsies to Europe until the mid-nineteenth century, Part 2 describing the birth of the first modern Romani organizations from the nineteenth century up until the Second World War (WWII) and Part 3a covering the first wave of expansion of Romani activism countrywide after 1945. As mentioned in Part 3a, the period between WWII and 1970 can be distinguished from the previously covered periods by the emergence of the following phenomena: (1) modern Romani political organizations at the national level, (2) their unification through international Romani umbrella organizations, (3) some limited Romani participation in non-Romani mainstream political or administrative structures, (4) an international Romani evangelical movement, (5) reconciliation between Romani political representation and the Catholic Church, (6) national institutions created by various governments to aid the administration of policies on Roma, (7) rapid growth of non-governmental organizations addressing Romani issues, and (8) some limited cooperation between Romani organizations and intergovernmental organizations.