The thing that the Radical Republicans wanted from the South before allowing its states to rejoin the Union was for them to form an agreement to let slaves gain the right to vote.
The Radical Republicans were in control of Congress after the American Civil War had ended in defeat for the South.
The Radical Republicans believed that African Americans should not only be free, but that they should have the right to vote and so they demanded this from the South before they could rejoin.
Find out more on the Radical Republicans at https://brainly.com/question/24974616
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