Removing Erroneous Revisions

So if I committed a bunch of stuff that I shouldn't have committed (due
to a dumb error on my part), then merged it to another branch, and
committed that, is there any way to undo it all -- to remove several
revisions off the head of the repository -- other than something with
svndump?

If I do have to use svndump, how do I remove a revision? The FAQs
cover removing a file but not a revision.

Or, can I just delete the revision subdirectories that I don't want, if
my working copies are restored to a date before that? It's an FSFS
repository?

Or is this some option that's staring me in the face and I just didn't
see it?

Thanks,

--
Tom
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