Final answer:
Supreme Court decisions on freedom of the press have both limited and expanded press freedom.
Step-by-step explanation:
The impact of Supreme Court decisions on freedom of the press has been both positive and negative. While there have been instances where press freedom has been limited in the interest of national security, such as in cases involving classified information, there have also been landmark rulings that have expanded press freedom. For example, in the Pentagon Papers case, the Court ruled that the government could not prevent the New York Times and Washington Post from publishing classified materials related to the Vietnam War, prioritizing the rights of the press.