What was one of the main goals of the ku klux klan after the civil war?

to rebuild the cities of the south
to educate formerly enslaved people
to aid radical reconstruction
to oppose radical reconstruction.

One of the main goals of Ku klux clan was: to oppose Radical Reconstruction.

Back then, the Republican party wanted to reconstruct the southern states to create income equality between the black and white citizens.
Ku Klux klan filled with white supremacist that do not want this to happen.