With the German invasion and occupation of the country in April–May 1941, several hundred members were able to escape and flee to the underground. Their first task was to reform the party, along with subsidiary groups like the "National Solidarity" (Εθνική Αλληλεγγύη, EA) welfare organization 28 May. After the German attack on the Soviet Union on 22 June and the break of the Molotov–Ribbentrop Pact, the newly reconstituted Communist Party found itself firmly on the anti-Axis camp , a line confirmed by the Party's 6th Plenum during 1–3 July. The Communists were committed to a "Popular Front" tactic, and tried to engage other parties from the left and the centre, including established pre-war politicians. However, the efforts proved largely fruitless. On 16 July, however, the "National Workers' Liberation Front" (Εθνικό Εργατικό Απελευθερωτικό Μέτωπο, ΕΕΑΜ) was established, bringing the country's labour union organisations together.