Answer:
True.
Step-by-step explanation:
They were a faction of the Marxist Russian Social Democratic Labour Party founded by Vladimir Lenin and Alexander Bogdanov.
In 1912 they split from the RSDLP and formed their own party. Five years after they took power in Russia overthrowing the republican government created after the abdication of the Tsar a couple of months before. The Bolsheviks lead both the February and October Revolution and became the only ruling class in Soviet Russia and the Soviet Union.
I hope this answer helps you.