1930’s democrats impeached and removed this Coolidge Judge
https://en.wikipedia.org/wiki/Halsted_L._Ritter
Sounds to me like the charges were BS. He was convicted on one charge of “Bringing the judiciary into disrepute” despite being acquitted on all specific charges.
They had tried and failed to remove another Coolidge Judge.
There were far more solid grounds for impeaching Lincoln than for Johnson or Trump. Lincoln directly defied several Constitutional articles. He put political opponents in jail. He muzzled the Press, etc. Johnson disobeyed a patently unConstitutioinal law passed to tie his hands and was impeached for that. The Congress tried the same thing against Nixon i.e. made it illegal to fire an appointed employee of the Executive branch.