The order they were mentioned in the Constitution of the USSR; also the order in which the motto appeared in the USSR Coat of Arms. This roughly corresponds to the population size of the republic when it was created.
The Soviet Union was established in December 1922 as the union of the Russian (colloquially known as Bolshevist Russia), Ukrainian, Belarusian, and Transcaucasian Sovietrepublics ruled by Bolshevik parties.
List of Soviet Presidents:(Chairman of the Central Executive Committee of the All-Russian Congress of Soviets (1917-1922); Chairman of the Central Executive Committee of the USSR (1922-1938); Chairman of the Presidium of the Supreme Soviet of the USSR (1938-1989); Chairman of the Supreme Soviet of the USSR (1989-1990); President of the Soviet Union (1990-1991))
The Soviet Union occupied the eastern portion of the European continent and the northern portion of the Asian continent.
The Soviet state is organized and functions on the principle of democratic centralism, namely the electiveness of all bodies of state authority from the lowest to the highest, their accountability to the people, and the obligation of lower bodies to observe the decisions of higher ones.
A Deputy of the Supreme Soviet of the USSR may not be prosecuted, or arrested, or incur a court-imposed penalty, without the sanction of the Supreme Soviet of the USSR or, between its sessions, of the Presidium of the Supreme Soviet of the USSR.
The Procurator-General of the USSR is appointed by the Supreme Soviet of the USSR and is responsible and accountable to it and, between sessions of the Supreme Soviet, to the Presidium of the Supreme Soviet of the USSR.