The State Duma (Russian: Госуда́рственная ду́ма, tr. Gosudárstvennaya dúma), commonly abbreviated in Russian as Gosduma (Russian: Госду́ма), is the lower house of the Federal Assembly of Russia, while the upper house is the Council of the Federation. The Duma headquarters are located in central Moscow, a few steps from Manege Square. Its members are referred to as deputies. The State Duma replaced the Supreme Soviet as a result of the new constitution introduced by Boris Yeltsin in the aftermath of the Russian constitutional crisis of 1993, and approved by the Russian public in a referendum.