FBI–King suicide letter, or blackmail package, was a 1964 anonymously-signed letter or package by the Federal Bureau of Investigation (FBI) meant to blackmail Martin Luther King, Jr. On November 21, 1964 a letter accompanied with a tape recording of King's sexual indiscretions contained inside a mailed package was delivered to Coretta Scott King and later to Martin Luther King, Jr. Although the letter was anonymously written, Martin Luther King, Jr. believed the FBI sent the package.