An item reported that the around 300 Soviet sailors stationed at Gdynia and the same number at Spiewowo, eastern Gdansk left Poland towards Kaliningrad, Soviet Union in May 1951.
Source
The report was published on www.archive.org, document number CIA-RDP82-00457R008900070011-9
Source
The report was published on www.archive.org, document number CIA-RDP82-00457R008900070011-9