Seem to recall FDR changed the ballance of th eCOurt from
37-41-appointing Black(from the KKK),Reed,Frankfurter(an
ACLU /Commie symp) douglas ,Murphy ,Byrnes,and Jackson.and YES it was a very bad idea- one whose consequesnses we have not recovered from.
His plan to pack the Court failed, but he was in office long enough to have a huge effect. Here's the relevant Wikipedia section:
President Franklin D. Roosevelt attempted to expand the Court (see Judiciary Reorganization Bill of 1937); his plan would have allowed the President to appoint one new, additional justice for every justice who reached the age of seventy but did not retire from the bench, until the Court reached a maximum size of fifteen justices.Ostensibly, this was to ease the burdens of the docket on the elderly judges, but it was widely believed that the President's actual purpose was to add Justices who would favor his New Deal policies, which had been regularly ruled unconstitutional by the Court.
The plan failed in Congress and the court changed course (see the switch in time that saved nine). In any case, Roosevelt's long tenure in the White House allowed him to appoint a large number of Justices.