Which of the following actions was established in 1925 regarding the Supreme Court?

The action established in 1925 regarding the Supreme Court was the control over its docket. This development was primarily facilitated by the Judiciary Act of 1925, also known as the "Certiorari Act." Before this act, the Supreme Court had limited discretion in selecting which cases it would hear, as it was required to take on all appeals from lower courts in certain instances.

With the enactment of the 1925 Act, the Supreme Court was granted the authority to exercise discretion in its caseload, allowing it to choose which cases to consider by issuing writs of certiorari. This represented a significant shift as it enabled the Court to focus on cases that had broader implications for the law or involved significant constitutional questions, rather than being overwhelmed by the volume of cases that could be sent to it.

Understanding this historical context is crucial, as it highlights the evolving nature of the Supreme Court's role within the judicial system and the necessary checks the legislature can impose to ensure that the Court can function effectively. The other choices refer to different aspects of judicial structure and function, but they do not pertain to the specific change that took place in 1925.