The Ku Klux Klan , whites
The Ku Klux Klan was a group of militant white supremacists that ravaged mostly the south (pre-confederate states), and lynched & terrorized previously African American Slaves. They also tried to keep African Americans from being able to use their rights to the full ability.
Depending on the context of the time the answer could be Ku Klux Klan- Whites, or Red Shirts-Democratic Party. I believe that the answer that best fits is the second one.
The Red Shirts was an extremist group that operated in the South. They attacked blacks in broad daylight. They mainly wanted to restore the Democrats to power.
The Red Shirts were a white supremacist group in the South of the United States by the late 19th Century during the Reconstruction Era.
The group was born in Mississippi. The private terror units decided to adopt red shirts to be more visible than the Republicans.
I hope this answer helps you.
workers of lowell mills were greatly benefited for the waltham type of work which was more a paternalist kind, trying to protect the integrity of this little girls coming from small farmers and providing an adequate place of work, this in an effort to avoid the issues of bad place conditions and immorality that the people in bigger industrialized cities of great britain were experimenting.