The regime believed that the only way to avoid a repeat of the disaster of 1918 was to secure workers' support for the German government. The regime also insisted through propaganda that all Germans take part in the May Day celebrations in the hope that this would help break down class hostility between workers and burghers. Songs in praise of labour and workers were played by state radio throughout May Day as well as an airshow in Berlin and fireworks. Hitler spoke of workers as patriots who had built Germany's industrial strength and had honourably served in the war and claimed that they had been oppressed under economic liberalism. "Berliner Morgenpost" that had been strongly associated with the political left in the past praised the regime's May Day celebrations.