Luckenbach Company v. United States…
“ Not only may whole classes of cases be kept out of the jurisdiction altogether, but particular classes of questions may be subjected to re-examination and review, while others are not. To our minds it is no more unconstitutional to provide that issues of fact shall not be retried in any case, than that neither issues of law nor fact shall be retried in cases where the value of the matter in dispute is less than $5,000. ”
