Vasile Kogălniceanu, the youngest son, was noted for his involvement in agrarian and left-wing politics during the early 20th century. A founder of "Partida Țărănească" (which served as an inspiration for the Peasants' Party after 1918), he was a collaborator of Vintilă Rosetti in campaigning for the universal suffrage and legislating Sunday rest. A manifesto to the peasants, issued by him just before the Peasants' Revolt of 1907, was interpreted by the authorities as a call to rebellion, and led to Kogălniceanu's imprisonment for a duration of five months. A member of the Chamber of Deputies for Ilfov County, he served as a "rapporteur" for the Alexandru Averescu executive during the 1921 debates regarding an extensive land reform.