Malloy v. Hogan is a landmark Supreme Court case from 1964 that held that the Fifth Amendment's protection against self-incrimination is applicable to state courts through the Fourteenth Amendment's Due Process Clause. This decision established that individuals cannot be compelled to testify against themselves in state proceedings, ensuring that this fundamental right is uniformly protected across both federal and state levels. It played a crucial role in reinforcing the rights of defendants and the principle of fair trial in the justice system.