They were called communists.
I think you are referring to the Bolsheviks.
The new name 'Communists' was adopted by Bolsheviks at their Seventh Party Congress in March 1918.Note: The 'Bolsheviks' as a faction of the Russian Social Democratic Party are not to be confused with another socialist party named 'Socialist Revolutionaries.' This question specifically uses the term "socialist revolutionaries," but it obviously does not mean the political party that was then known as the "Socialist Revolutionaries," because the "Socialist Revolutionaries", as well as all other political parties, were abolished by the Communists.The new name taken was "Communists." Prior to March 1918, they were known as Bolsheviks.
The Russian socialist revolutionaries under Lenin were known as Bolsheviks until March 1918 when they adopted the name Communists at their Seventh Party Congress. Note: The 'Bolsheviks' as a faction of the Russian Social Democratic Party are not to be confused with another socialist party named 'Socialist Revolutionaries.' This question specifically uses the term "socialist revolutionaries," but it obviously does not mean the political party that was then known as the "Socialist Revolutionaries," because the "Socialist Revolutionaries" were abolished by the Communists.
The new name 'Communists' was adopted by Bolsheviks at their Seventh Party Congress in March 1918. Note: The 'Bolsheviks' as a faction of the Russian Social Democratic Party are not to be confused with another socialist party named 'Socialist Revolutionaries.' This question specifically uses the term "socialist revolutionaries," but it obviously does not mean the political party that was then known as the "Socialist Revolutionaries," because the "Socialist Revolutionaries", as well as all other political parties, were abolished by the Communists.
communists
By 1922, the Russian socialist revolutionaries who had taken over Russia were known as "Communists." They had been the "Bolsheviks" until they held their Seventh Party Congress in March 1918 and adopted the name Communists. There had been other revolutionary parties, (one was the "Social Revolutionaries") besides the Bolsheviks, but the Bolsheviks were the only ones that survived until 1922.
The first new name of Russia was the Russian Soviet Federal Socialist Republic, which was adopted in July 1918. In 1922, the RSFSP joined with Ukraine, Belorussia and the Transcaucasus Federation (Georgia, Armenia an Azerbaijan) to become a new nation, the Union of Soviet Socialist Republics (USSR). Russia's name was not just changed to the USSR.
Nickolas Romanov II was that ruler.
Bolshevik
They called themselves the Bolsheviks, which in Russian means 'majorityites'. This term was misleading, because it arose at the 1903 at the Russian Social Democratic Party (Marxists) Congress in Brussels, when the party split into two factions over the issue of strictness of party discipline over its members. The Bolsheviks were actually the minority faction when a number of conservative members of the party walked out in protest at Lenin's agitations. This gave Lenin's more radical followers a temporary one vote majority. He seized this opportunity to name his faction Bolsheviviks. Lenin's faction was soon returned to its minority status but kept its majorityite name. The majority faction, for some reason, accepted the name Mensheviks, which meant minorityites. In March 1918, at the Bolsheviks' Seventh Party Congress, they adopted the name Communist. Please note: Prior to the October Revolution there was another socialist political party named "Socialist Revolutionaries." Although this question specifically refers to "socialist revolutionaries," it is obvious that it actually contemplates the Bolshevik Party, since the Bolshevik Party changed its name to the Communist Party in March 1918. The Socialist Revolutionaries, as a party disappeared when the Bolsheviks abolished all political parties but their own.
The Russian Socialists called Russia The Union of Soviet Socialist Republics or the USSR for short.The USSR was not just a new name given to Russia after the revolution.The first new name for Russia was the Russian Soviet Federal Socialist Republic(RSFSR) so named in the new Constitution in July 1918. In 1922, the RSFSR joined with Ukraine, Georgia and the Transcaucasus Federation (Armenia, Georgia and Azerbaijan) to form a new nation, the Union of Soviet Socialist Republics.
There were several Russian socialist parties in 1918. The main one was the Bolshevik Party, which renamed itself the Communist Party in March. There was also the Mensheviks, who were the remnants of the Russian Social Democratic Labor Party after the Bolsheviks left that party. There also was a party named the Social Revolutionaries. Note that even though the Bolsheviks called themselves Communist, they were actually imposing a socialist, not a communist form of government at that time.