During the Second World War, some citizens were evacuated to the UK but most remained. Jersey was occupied by Germany from 1 July 1940 until 9 May 1945, when Germany surrendered. During this time the Germans constructed many fortifications using Soviet slave labour. After 1944, supplies from France were interrupted by the D-Day landings, and food on the island became scarce. The SS "Vega" was sent to the island carrying Red Cross supplies and news of the success of the Allied advance in Europe. During the Nazi occupation, a resistance cell was created by communist activist Norman Le Brocq and the Jersey Communist Party, whose communist ideology of forming a 'United Front' led to the creation of the Jersey Democratic Movement. The Channel Islands were one of the last places in Europe to be liberated. 9 May is celebrated as the island's Liberation Day, where there are celebrations in Liberation Square.