Karl Berngardovich Radek was a Bolshevik and an international Communist leader. He was born in then Lemberg (now L'viv in Ukraine, then in Austro-Hungary), as Karol Sobelsohn, to a Jewish family. He took the name "Radek" from a favourite character in a book (perhaps "Syzyfowe prace" by Stefan Żeromski). A member of the Russian Social Democratic Labour Party (RSDLP) since 1898, he participated in the 1905 Revolution in Warsaw. Wikipedia
The definitive Wikipedia entry for Karl Radek. Wikipedia is the biggest multilingual free-content encyclopedia on the Internet. en.wikipedia.org/wiki/Karl_Radek
