IMO, the two worst of all time were William O. Douglas and Anthony Kennedy.
But most of the Justices that ever served on the Court were just plain mediocre -- did not deserve to be on a court that ought to consist of the most highly objective interpreters of law that can be found anywhere in the country.
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LoL O Douglas did have Brown v Board of Ed , Miranda and Public Defender laws there were no Public Defenders in the S that's why Dixiecrats judges sentenced Blk men to Chain gangs from 1865/1955