Which party at the beginning of the 20th century considered it possible to use the tactics of terror?

If we talk about the Russian Empire, then most likely it is worth talking about the party of socialist-revolutionaries, who are better known as the Socialist-Revolutionaries (the name is the abbreviation of this party). They believed that they would inherit populism, which offered its own, special way of establishing socialism, bypassing the formation of capitalism. For this, they proposed the beginning of the development of socialism in the countryside, where it was necessary to distribute land. They were also champions of the idea of revolutionary terror, which they embodied in their high-profile actions.