Background
He was the son of Feliks Józef, an official, and Wanda Izabela Mieczkowska.
He was the son of Feliks Józef, an official, and Wanda Izabela Mieczkowska.
In 1914 he graduated from the Trade School in Mława and started chemical studies at University of Warsaw, which he never completed.
The same year he joined the Polish Socialist Party (Parliamentary Private Secretary) and Polish Military Organisation in the district of CiechanóWest After completing the plebiscite course he went to Upper Silesia to work on the plebiscite organization. He was an editor of The Workers Paper.
He left Parliamentary Private Secretary on September 18, 1920 after being accused of communist tendencies.
In the Third Silesian Uprising (May – July 1921) he was a leader of a subdivision in the Wawelberg Group. His conspiratorial pseudonym was Zdzisław Zagozda.
He co-organised Independent Peasants" Party. In 1923 de Nisau joined the Communist Party of Poland.
Their son Witold was born in 1924.
In 1927 Bohdan left to the Soviet Union. His family joined him soon after that, having left Poland on false documents. In the Soviet Union he worked under the name Egon Bogdanowicz Sztern, at first in chemical plant in Dzerzhinsk and since 1933 as a head of chemical laboratory in Horlivka.
In fact Bohdan died in prison in Voronezh only in 1943.
In 1919 he joined Union of Independent Socialist Youth (ZNMS). He was arrested in 1934, in the time of Great Purge, and was accused of trotskyism.
As a member of PMO he took part in disarming German soldiers in 1918, when Poland regained its independence. In August 1920 de Nisau took part in the Second Silesian Uprising and later was a member of the Wawelberg Group. He was a member of the Executive Committee of ZNMS since 1922 until the group"s break up in 1923.