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Qal'achai Kalon (Russian: Калачаи-Калон; Tajik: Қалъачаи Калон), formerly known as Kommunizm (Tajik: Коммунизм), is a village and jamoat in north-western Tajikistan. It is part of the city of Istaravshan in Sughd Region. The jamoat has a total population of 15,433 (2015).