No, it's not currently supported in SVN. From the FAQ:
The project has plans, however, to someday implement an svnadmin obliterate
command which would accomplish the task of permanently deleting information. (See issue 516.)
However, there is a workaround that can work in some cases:
In the meantime, your only recourse is to svnadmin dump
your repository, then pipe the dumpfile through svndumpfilter
(excluding the bad path) into an svnadmin load
command. See chapter 5 of the Subversion book for details about this.
The filter mechanism works at the file path level, including or excluding parts of the repository as a whole across all revisions. This is often insufficient if you want to omit a particular revision of a file, or you've committed files to a filtered path before or after the offending revision that you want to keep.