 After the communist takeover of Poland he gradually dismantled his underground net and moved to Gdańsk.A member of the Wolność i Niezawisłość anti-communist resistance, under the false name "Leon Juchniewicz" he became the first managing director of the demolished Gdańsk Shipyard.His tasks included reconstructing the shipyard, which had been devastated by Allied air raids and by the withdrawing Germans.