Some Russians supported the Bolshviks because they felt they offered a chance to escape the miserable living conditons imposed by the tsarist regime.
The Bolsheviks overthrew the government in a coup d'etat in the Bolshevik Revolution.
because they had the support of public.
"Peace, Bread, and Land"
They didn't worry about support. If you were against them you disappeared, was sent to a work camp, or killed. Very simple.
The Bolsheviks and Vladimir Lenin wanted to overthrow the government because a lot of Russians were killed in World War I and Russia had social and economic problems.
During the Russian Civil War the US and other Western powers sent expeditionary forces into Russia to help those that were fighting the Bolsheviks, the white Russians, through equipment, training and manpower.
The Slavic people were the same ethnic group as the Russians, so they wanted to support them against Austria-Hungary, whom Russia was fighting land for.
In (and even before) 1917 in Imperial Russia, the Bolsheviks gained mass-support for numerous reasons. Most of the reasons, however, centered on the corruption, inefficiency, and failures of the Russian royal dynasty and its administration as the governing power in Russian.
The Slavic people were the same ethnic group as the Russians, so they wanted to support them against Austria-Hungary, whom Russia was fighting land for.
The Russians had to pull out for several reasons during World War 1. Primary reason was the civil revolution which was going on in Russia. The secondary reason was lack of funding and the distance required to supply and fight the war was too great. Another reason was that the Tsar was killed by the Bolshiveks.....communist forerunners of the USSR. They didn't have to. They chose to, because the war served no purpose for them and doing so increased political support for the Bolsheviks.
In George Orwell's "Animal Farm" the Bolsheviks are represented by the pigs.
Not only did Germany fun the Bolsheviks propaganda, but they continued to support them when they came into power in order to push forward their own agenda. This served the German purpose since the Bolsheviks were against the war and could be used as a demoralizing weapon against the Russian Army. .