Question: Paul A. Freund is known for his writings on what supreme law of the United States of America?

Context paragraphs:
Government of Vermont: The government of Vermont is a republican form of government modeled after the Government of the United States.  The Constitution of Vermont is the supreme law of the state, followed by the Vermont Statutes.  This is roughly analogous to the Federal United States Constitution, United States Code and Code of Federal Regulations respectively.  Provision is made for the following frame of government under the Constitution of the State of Vermont: the executive branch, the legislative branch, and the judicial branch.  All members of the executive and legislative branch serve two-year terms including the governor and senators.  There are no term limits for any office.

Article Six of the United States Constitution: Article Six of the United States Constitution establishes the laws and treaties of the United States made in accordance with it as the supreme law of the land, forbids a religious test as a requirement for holding a governmental position and holds the United States under the Constitution responsible for debts incurred by the United States under the Articles of Confederation.

Steve Freund: Steve Freund (born July 20, 1952, Brooklyn, New York City, New York, United States), is an American blues guitarist, singer, bandleader and record producer.  Freund has toured throughout the United States (including stops in New York and Chicago).  He is based in the San Francisco Bay Area, where he is best known.

Paul A. Freund: Paul A. Freund (February 16, 1908—February 5, 1992) was an American jurist and law professor.  He taught most of his life at Harvard Law School and is known for his writings on the United States Constitution and the Supreme Court of the United States.

Constitution of West Virginia: The Constitution of the State of West Virginia is the supreme law of the U.S. State of West Virginia.  It expresses the rights of the State's citizens and provides the framework for the organization of law and government.  In its first Article, the clause states that ""The state of West Virginia is, and shall remain, one of the United States of America.  The constitution of the United States of America, and the laws and treaties made in pursuance thereof, shall be the supreme law of the land.""  West Virginia is governed under its second and current Constitution which dates from 1872.  In November 1960 a Preamble was added.  The document includes fourteen articles and several amendments.

Confederate States Constitution: The Confederate States Constitution, formally the Constitution of the Confederate States of America, was the supreme law of the Confederate States, as adopted on March 11, 1861, and in effect from February 22, 1862, through the conclusion of the American Civil War.  The Confederacy also operated under a Provisional Constitution from February 8, 1861, to February 22, 1862.  The original Provisional Constitution is currently located at the American Civil War Museum in Richmond, Virginia, and differs slightly from the version later adopted.  The final, hand-written document is currently located in the University of Georgia archives at Athens, Georgia.  In regard to most articles of the Constitution, the document is a word-for-word duplicate of the United States Constitution.  However, there are crucial differences between the two documents, in tone and legal content, primarily regarding slavery.

United States Constitution: The United States Constitution is the supreme law of the United States of America.  The Constitution, originally comprising seven articles, delineates the national frame of government.  Its first three articles entrench the doctrine of the separation of powers, whereby the federal government is divided into three branches: the legislative, consisting of the bicameral Congress; the executive, consisting of the President; and the judicial, consisting of the Supreme Court and other federal courts.  Articles Four, Five and Six entrench concepts of federalism, describing the rights and responsibilities of state governments and of the states in relationship to the federal government.  Article Seven establishes the procedure subsequently used by the thirteen States to ratify it.

Criminal sentencing in the United States: In the United States, sentencing law varies by jurisdiction.  Since the US Constitution is the supreme law of the land, all sentences in the United States must conform to the requirements of the Constitution, which sets basic mandates while leaving the bulk of policy-making up to the states.

Ernst Freund: Ernst Freund (January 30, 1864 in New York City – October 20, 1932 in Chicago, Illinois) was a noted American legal scholar.  He received a Dr. Jur.  from the University of Heidelberg (1884); a Ph.D. in political science from Columbia University (1897) He was professor of political science at the University of Chicago (1894–1902) and professor of law at Chicago (1903–32).  He was John P. Wilson Professor of Law (1929–1932).  Freund was principally responsible for the development of administrative law in the United States during the early twentieth century.  He was one of the organizers of the Immigrants' Protective League (1908).  The University of Chicago Law School has established the Ernst Freund Distinguished Service Professorship of Law and Ethics in his honor, a seat currently held by philosopher Martha Nussbaum.

Supremacy Clause: The Supremacy Clause of the United States Constitution (Article VI, Clause 2) establishes that the Constitution, federal laws made pursuant to it, and treaties made under its authority, constitute the supreme law of the land.  It provides that state courts are bound by the supreme law; in case of conflict between federal and state law, the federal law must be applied.  Even state constitutions are subordinate to federal law.  In essence, it is a conflict-of-laws rule specifying that certain national acts take priority over any state acts that conflict with national law.  In this respect, the Supremacy Clause follows the lead of Article XIII of the Articles of Confederation, which provided that "Every State shall abide by the determination of the United States in Congress Assembled, on all questions which by this confederation are submitted to them."  A constitutional provision announcing the supremacy of federal law, the Supremacy Clause assumes the underlying priority of federal authority, at least when that authority is expressed in the Constitution itself.  No matter what the federal government or the states might wish to do, they have to stay within the boundaries of the Constitution.  This makes the Supremacy Clause the cornerstone of the whole American political structure.

Supporting paragraphs: Paul A. Freund United States Constitution
Answer: United States Constitution