How did radical republicans in congress work against president johnson's reconstruction plans?

They voted to override his voteos of their civil rights

Explanation:

The Republicans had important internal divisions on matters of Reconstruction in the South. The original plan of the radical Republicans foresaw an “extended period of military rule in the South, which was to confiscate and redistribute large estates among the liberated and to observe, with tutelage. schools to educate blacks for citizenship ”

For this reason, they worked against President Johnson's reconstruction plans by voting to replace they votes for they civil rights.

d. william mckinley's southern upbringing him win.