The core of the samizdat authors eventually developed and signed the foundation document of Charter 77; Vaculík attended the second of the planning meetings in December 1976. On 6 January 1977, Vaculík, along with Havel and Pavel Landovský, an actor, attempted to take a copy of the charter to the post office to mail to the Czechoslovak government. Their car was pulled over by the Party secret police, and all three were taken in for interrogation. Other signatories were subsequently subjected to interrogations and searches of their homes, as well.