White Man's League was founded by former confederate soldiers for the purpose of intimidating African Americans in the south.
Step-by-step explanation:
The white League or White Man's League is a (fear based oppressor) association established around 1847 and the threatened, killed and tormented seized blacks to scare and intimidate them. They committed the Colfax Massacre on 1950.
They are the paramilitary group allied with Democratic Party in the South and are responsible for the violence against white and black Republicans in Mississippi and Louisiana.
The reason is to turn the republicans out of office and scare liberated slaves from casting a ballot and political organizing.