Yan Karlovich Berzin

Yan (Ian) Karlovich Berzin (Russian: Ян Карлович Берзин; Latvian: Jānis Bērziņš; real name Pēteris Ķuzis; 25 November [O.S. 13 November 1889] 1889 – 29 July 1938) was a Latvian and Soviet communist politician and military intelligence officer.