Boris Viktorovich Savinkov (Russian: Бори́с Ви́кторович Са́винков) (19 January 1879 – 7 May 1925) was a Russian writer and revolutionary terrorist. As one of the leaders of the Fighting Organisation of the Socialist Revolutionary Party, he was responsible for the assassinations of several high-ranking imperial officials in 1904 and 1905.Later, he became Assistant War Minister in the Provisional Government.