The State Duma (), commonly abbreviated in Russian as Gosduma (), 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 people in a referendum.