 According to Harry Francis Mallgrave, these early works were "the first indication of what constituted constructivist architecture" (as opposed to earlier concept of constructivist art).In the end of 1922, Moscow City Hall announced a competition for the "Palace of Labor" on the downtown site of the present-day Hotel Moskva.It was the first national competition for a building perceived as "the" main building of the Soviet Union, with an 8,000-seat congress hall; ten years later, the idea resurfaced as the Palace of Soviets.