After the Civil War, which group wanted to punish the South and prevent the old southern rulers from returning to power?

Abolitionists? I'm not quite sure though.

The case was a u.s. supreme court decision that defined the scope of the u.s. congress's legislative power and how it relates to the powers of american state legislatures. the dispute in mcculloch involved the legality of the national bank and a tax that the state of maryland imposed on it.