The activities undertaken by groups such as the Ku Klux Klan, the Knights of the White Camellia, the Red Shirts, and the White League to undermine Reconstruction included:
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Harassing and employing violence against Black people's attempts at political mobilization - These groups engaged in brutal tactics to intimidate Black individuals who sought to participate in the political process.
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Using terrorism to prevent Black Americans from voting - They aimed to suppress Black voter turnout through threats, violence, and intimidation at polling places.
These activities were instrumental in undermining the goals of Reconstruction by fostering a climate of fear and limiting the political rights of Black Americans.
The other two options listed do not accurately reflect the primary objectives or activities of these groups in the context of undermining Reconstruction.