In February 1920, under pressure from Finland, Elfvengren resigned from the chairmanship of the interim committee of North Ingria, after which he collaborated with the Commander-in-Chief of the
White Army of South Russia,
Pyotr Wrangel, and the
Socialist Revolutionary Boris Savinkov. He was in contact with the rebels of the
Kronstadt rebellion and the counter-revolutionary group led by Tagantsev. In 1921, Wrangel promoted Elfvengren to the rank of major general in the White Army. In June 1921, together with Boris Savinkov, he established the ''
Citizens' Union for the Protection of Fatherland and Freedom'' in
Warsaw, aimed at overthrowing the Soviet government. Elfvengren was responsible for clandestine activities in Northwestern Russia, Finland, and the
Baltics. In 1922, the organization attempted to assassinate the Soviet Foreign Minister
Georgy Chicherin in
Geneva, but the plot failed. Elfvengren has been alleged to have been involved in the assassination of Soviet diplomat
Vatslav Vorovsky in 1923 in
Lausanne. Elfvengren resigned from the union in 1923, and the following year, Boris Savinkov was arrested in Moscow, where he had secretly arrived. Elfvengren subsequently worked as a businessman in Helsinki, but there is little information about his activities in his final years. In 1925, Elfvengren secretly traveled to Russia but was discovered and arrested by the
OGPU. He was executed by firing squad in June 1927 in Moscow. At the same time, 19 other individuals accused of counter-revolutionary activities were also executed in response to the assassination of Soviet diplomat
Pyotr Voykov, including several members of Russian noble families. == References ==