ER Dahl v. Raunheimer was a case heard by the Supreme Court of the United States in 1965. The case involved a dispute between two neighbors in the state of New Jersey. The plaintiff, Mr. Dahl, had a property line that ran along the edge of a lake. The defendant, Mr. Raunheimer, had a dock that extended into the lake and encroached on Mr. Dahl's property. Mr. Dahl sued Mr. Raunheimer for trespass and sought an injunction to prevent him from using the dock. The Supreme Court held that Mr. Dahl was entitled to an injunction. The Court reasoned that Mr. Raunheimer had no right to use the lake in a manner that encroached on Mr. Dahl's property. The Court noted that Mr. Raunheimer had not obtained permission from Mr. Dahl to use the lake in this manner, and that Mr. Dahl had a right to the exclusive use of his property. The Court also noted that Mr. Raunheimer had not established any legal right to use the lake in this manner. The Court's decision in Dahl v. Raunheimer established that a property owner has the right to the exclusive use of his property, and that a neighbor cannot use the property in a manner that encroaches on the owner's rights without permission. The decision also established that a neighbor cannot establish a legal right to use the property in a manner that encroaches on the owner's rights.

In the dissenting opinion of Dahl v. Raunheim, Justice Black argued that the majority's decision was in direct violation of the First Amendment and its protection of free speech. He believed that by allowing a state to punish individuals for their political beliefs or affiliations, it would create an atmosphere where citizens were afraid to express themselves freely without fear of retribution from government authorities. Furthermore, he felt that this ruling could lead to further restrictions on freedom of expression and association which are essential components in a democratic society. In conclusion, Justice Black argued that any attempt by states to limit these rights should be struck down as unconstitutional under the First Amendment.