The bitterest and longest-lasting legacy of the German occupation was the social upheaval it wrought. The old political elites were sidelined, and the Resistance against the Axis brought to the fore the leftist National Liberation Front (EAM), arguably the country's first true mass-movement, where the Communists played a central role. In an effort to oppose its growing influence, the Germans encouraged the pre-war conservative establishment to confront it, and allowed the creation of armed units. As elsewhere in Eastern Europe, in the last year of the occupation, conditions in Greece often approximated a civil war between EAM and other powers. The rift would become permanent in December 1944, when EAM and the British-backed government clashed in Athens, and again in a fully fledged civil war from 1946–1949.