How did Grant fight against the violence of the KKK?

Grant against Democrat Horatio Seymour, was crucial. Republicans would continue programs that prevented Southern whites from gaining political control in their states. Klan members knew that given the chance, the blacks in their communities would vote Republican.

Explanation:In the 1868 presidential election, Republican Ulysses S. Grant won the office with the slogan, "Let Us Have Peace." Republicans also won a majority in Congress. Many Northerners, disgusted by Klan violence, lent their support to the Fifteenth Amendment, which gave the vote to black men in every state, and the First Reconstruction Act of 1867, which placed harsher restrictions on the South and closely regulated the formation of their new governments.

Explanation: With passage of the Third Force Act, popularly known as the Ku Klu

Congress authorizes President Ulysses S. Grant to declare martial law, impose heavy penalties against terrorist

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explanation:

they were citizens but they could not vote and they did could not get involved into a political situation during that time.