Poznań June 1956
On Thursday, June 28th, 1956, at 6:30am, the main factory siren was sounded in the Joseph Stalin Poznań Metal Works (ZISPO, then called the Hipolit Cegielski Metal Works). For workers present on site, distressed with their economic situation and disappointed with both deteriorating working conditions and their demands being ignored by the authorities, it was a signal to start a demonstration.