All of them were socialistrepublics, and all of them, with the exception of Russia had their own Communist parties.
General practice in the republics outside of Russia was that the head of state in a republic was a local official while the party general secretary was from outside the republic.
An attempt to declare the Polish SovietSocialistRepublic was made during the Soviet assault in the Polish-Soviet War of 1919–1922, by the Polish Provisional Revolutionary Committee headed by Julian Marchlewski in Bialystok.
The Transcaucasian Soviet Federated SocialistRepublic was a short-lived (1922-1936) Sovietrepublic, consisting of Georgia, Armenia, and Azerbaijan, which were traditionally known as the Transcaucasian Republics in the Soviet Union.
The republic's roots date back to the dissolution of the Russian Empire in 1917, during the Russian Revolution, when the provinces of the Caucasus seceded and attempted to form their own federal state called the Transcaucasian Federation.
In 1936, the republic was dissolved and the three regions became individual republics of the Soviet Union.