Question

Radical republicans in congress wanted to provide more rights for formerly enslaved people, so they

Answer 1

Radical republicans in congress wanted to provide more rights for formerly enslaved people, so they "resisted" efforts in Congress to end Reconstruction early by pulling out Union troops from the South. 

Answer 2

Radical Republicans in Congress wanted to provide more rights for formerly enslaved people, so they overturned several of President Johnson's vetoes.

The Radical Republicans were a faction of American politicians within the Republican Party of the United States from around 1854 until the end of Reconstruction in 1877.

They considered themselves radicals refering to a complete permanent eradication of slavery and secessionism.