- Jamgotch, Nish1
- Johnston, Douglas M.1
- Kassof, Allen1
- Kautsky, John H.1
- Kemény, István1
- Kidron, Michael1
- Király, Béla1
- Kos-Rabcewicz-Zubkowski, Ludwik1
- Kołakowski, Leszek1
- Krassó, György1
- Lazarsfeld, Paul F.1
- Leiden, Carl1
- Lipski, Józef1
- Liu, Shaoqi1
- Lunacharsky, Anatoly Vasilievich1
- Macartney, C. A.1
- Madison, Bernice Q.1
- Magos-Gimes, Judith Juca1
- Mao, Zedong1
- Margulies, Sylvia R.1