In 1940, Romania had to cede Bessarabia and Northern Bukovina to the Soviet Union and Southern Dobruja to Bulgaria ("see Soviet occupation of Bessarabia, Treaty of Craiova"); in contrast with the general mood, the PCdR welcomed both gestures along the lines of its earlier activism. Official history, after ca. 1950, stated that the PCdR protested Northern Transylvania's cession to Hungary later in the same year (the Second Vienna Arbitration), but evidence is inconclusive (party documents attesting the policy are dated after Nazi Germany's invasion of the Soviet Union). As the border changes sparked a political crisis leading to an Iron Guard takeover—the National Legionary State—the interior wing's confusion intensified: the upper echelon faced investigation from Georgi Dimitrov (as well as other Comintern officials) on charges of "Trotskyism", and, since the FRN had crumbled, several low-ranking party officials actually began collaborating with the new regime. At around the same time, a small section of the exterior wing remained active in France, where it eventually joined the Resistance to German occupation—it included Gheorghe Gaston Marin and the "Francs-tireurs"' Olga Bancic, Nicolae Cristea and Joseph Boczov.