Final answer:
The Czar supporters and the Republicans were the groups of Russians who supported the White Army during Russia's Civil War.
Step-by-step explanation:
The group of Russians who supported the White Army during Russia's Civil War were the Czar supporters and the Republicans. The White Army, also known as the counter-revolutionaries, were composed of various groups, including former Tsarists who wanted to restore the monarchy and Republicans who opposed the Communist regime. They formed an alliance against the Bolsheviks, who were the Communist group led by Vladimir Lenin.