sentences:  Filipchenko was arrested in December 1905 due to being present at a meeting of the Soviet Workers' Deputies, but was released shortly afterwards.However, Filipchenko was arrested later the same month after helping to organize workers in the Nevsky District of Saint Petersburg, serving four months in prison during which he studied both philosophy and for government examinations.Though he would later join the Schlisselburg Committee, which assisted with the plight of political prisoners, and the Socialist Revolutionary Party, Filipchenko stepped away from politics after 1906 to focus his attention on scientific pursuits.