During the German occupation, Mieczysław Fogg, a singer, provided help to his Jewish friends from the artistic milieu. Amongst the people who temporarily resided at 69 Koszykowa Street one may list: Ivo Wesby, a conductor, with wife and daughter, engineer Stanisław Tempel, a friend of the ‘Syrena Record’ company, and Stanisław Kopf, singing instructor. Stefan Glücksberg, Fogg’s school friend, was also hiding on Koszykowa Street. He escaped from a transport to Treblinka death camp in 1942. Ignacy Zalcsztajn was hiding in the flat belonging to the building’s concierge. Fogg delivered food to him and provided for him financially.
When the underground Polish Artists’ Union allowed him to perform, Fogg began earning money in various coffee houses. Sometimes, Gestapo members were in the audience. One of them interrupted the concert and accused the artist of agitating the Poles and threatened to kill him – at the time, Fogg used to perform a wartime hit entitled ‘Ukochana, ja wrócę’ (I shall return, my love). After the incident, the tenement building on Koszykowa Street was closely watched and Mr Fogg himself had to report repeatedly at the Gestapo headquarters on Szucha Avenue.