What US Supreme Court cases held that electronic eavesdropping was a search and seizure under the Fourth Amendment?

The key U.S. Supreme Court case that established that electronic eavesdropping constitutes a search and seizure under the Fourth Amendment is Katz v. United States (1967). In this landmark decision, the Court ruled that the government's monitoring of a phone call without a warrant violated the Fourth Amendment, reaffirming the principle that individuals have a reasonable expectation of privacy in their conversations. This case expanded the interpretation of "search and seizure" to include electronic surveillance, setting a precedent for future rulings on privacy rights.