Lucy Ash explores the world of the security forces that keep Lukashenko in power, peeling back the ubiquitous balaclavas to find the men and women beneath. Minsk, early December. A wall of masked men in black body armour, beating their truncheons on steel shields. In front of them stand women bundled in winter coats and teenagers wrapped in red and white flags. They are singing a protest song once heard in the revolutionary shipyards of Gdansk a generation before - an anthem for democracy and change.