Abraham Lincoln wanted to reunite the country with as little hassle as possible towards to end of the Civil War and proposed that 10% of the white males in Confederate states take loyalty oaths for their states to be readmitted and also for those states to permanently free enslaved people.
Senator Benjamin F. Wade and Representative Henry Winter Davis thought these requirements too mild and proposed that 50% of males take the loyalty oaths and grant blacks the right to vote. Congress preferred this and passed this bill but President Lincoln vetoed it by refusing to sign.
The Russian Civil War is a bloody, 6 long year conflict resulting in 7 to 12 milions total casualties. In contrast, WW1 costed about 40 millions lives worldwide. Which means the Russian Civil War has 1/4 of the casualties of WW1, one of the deadliest in history.
