Members of Young Sinn Féin climb the RTÉ mast at the Donnybrook studios in Dublin on 13 June 1984.
They were protesting against Section 31 of the Broadcasting Act, a directive which meant that interviews with Sinn Féin could not be broadcast by the station.
Three men and a woman took part in the occupation, all from Fianna Éireann, Sinn Féin's youth wing. They were later charged with breaching the peace.
An RTÉ News report broadcast on 13 June 1984. This clip is mute.