- Kropotkin, Petr Alekseevich2
- Kun, Miklós2
- Laird, Roy D.2
- Lane, David Stuart2
- Lee, Asher2
- Lendvai, Paul2
- Lenin, Vladimir Ilʹich2
- Leonhard, Wolfgang2
- Levitin-Krasnov, A. E.2
- Librach, Jan2
- Linden, Carl A.2
- Lisavtsev, Emilii Ivanovich2
- Litvinov, M. M.2
- Lockhart, Robert Hamilton Bruce2
- Lunacharsky, Anatoly Vasilievich2
- Lustiger, Arno2
- Mann, Dawn2
- Marchenko, Anatolii2
- Marker, Chris2
- Mastny, Vojtech2