Союз русского народа
Sergei Iosifovich Trishatny ( — after ) was an elder brother of Alexander Trishatny, with whom he worked in the supreme bodies of the Union of the Russian People ("URP"), a loyalist right-wing nationalist party, the most important among Black-Hundredist monarchist and antisemitic political organizations in the Russian Empire of 1905–1917. In 1905–1908 he was a secretary of the URP. In January 1920, he was detained and in April 1920, he escaped from a detention camp. After that, all traces of him were lost.