Douglas’s notable opinions included Griswold v. Connecticut (1965)—which established the constitutional right to privacy, and was foundational to later cases such as Eisenstadt v. Baird, Roe v. Wade, Lawrence v. Texas and Obergefell v. Hodges—Skinner v. Oklahoma (1942), United States v. Paramount Pictures, Inc. (1948), Terminiello v. City of Chicago (1949), Brady v. Maryland (1963), and Harper v. Virginia State Board of Elections (1966).
Douglas also served as an associate justice in the landmark civil rights case Brown v. Board of Education (1954), a Supreme Court case that outlawed segregation in American public schools. He wrote notable concurring or dissenting opinions in cases such as Dennis v. United States (1951), United States v. O’Brien (1968), Terry v. Ohio (1968), and Brandenburg v. Ohio (1969). He was also known as a strong opponent of the Vietnam War and an ardent advocate of environmentalism.
https://en.wikipedia.org/wiki/William_O._Douglas