Union of the Russian People
When the Russian revolution of 1905 began, Sergei Trishatny was a barrister. In October 1905 together with his younger brother, Alexander Trishatny took part in the organization of the Union of the Russian People (URP) under the leadership of Alexander Dubrovin. When on the founding of the "Union of the Russian People" was formally announced, Sergei Trishatny was appointed a Secretary, while his brother Alexander Trishatny became the deputy chairman of the Main Board () of this union, headed by Dr. Dubrovin.