1924 Constitution of the Soviet Union
The 1924 Soviet Constitution legitimized the December 1922 Treaty on the Creation of the USSR between the Russian SFSR, the Ukrainian SSR, the Byelorussian SSR, and the Transcaucasian SFSR to form the Union of Soviet Socialist Republics (USSR).
In essence, it was but an expansion and generalization of the Treaty, with most of the major parts were specified already by the treaty; it also allowed for a potential expansion of the USSR.
Whereas the original Treaty had only 26 articles, the Constitution now had 72, divided into eleven chapters. Ratified by the Second Congress of Soviets of the Soviet Union 31 January 1924, it survived six editions, before being superseded by the 1936 constitution.
It established the Congress of Soviets to be the supreme body of state authority, with the Central Executive Committee having this authority during the interims. The Central Executive Committee is divided into the Soviet of the Union, representing the constituent republics, and the Soviet of Nationalities, representing directly the interests of nationality groups. The Central Executive Committee served as the collective presidency. Between sessions of the Central Executive Committee, the Presidium supervised the government administration. The Central Executive Committee also elected the Council of People's Commissars, which served as the executive part of the government.