RSGB meaning in International ?

Answer: What is Russian Soviet Government Bureau mean?

The Russian Soviet Government Bureau (1919-1921), sometimes known as the "Soviet Bureau," was an unofficial diplomatic organization established by the Russian Soviet Federative Socialist Republic in the United States during the Russian Civil War. The Soviet Bureau primarily functioned as a trade and information agency of the Soviet government. Suspected of engaging in political subversion, the Soviet Bureau was raided by law enforcement authorities at the behest of the Lusk Committee of the New York State legislature in 1919. The Bureau was terminated early in 1921.

reference

Full Form	Category
Radio Society of Great Britain	Academic & Science
Reform Synagogues Of Great Britain	Community
Russian Soviet Government Bureau	International
Russian Spetsnaz Guards Brigade	International