Some posters from the Repeal Section 31 Campaign.
Under Section 31 of the Broadcasting Authority Act, it was forbidden to broadcast the voice of Sinn Féin members. The Act ran from 1971 until it was lifted by the then Minister for Arts, Culture & the Gaeltacht Michael D. Higgins.
There was a similar law in the UK which was gotten around by using actors voices instead of the interviewees.
Many thanks to the sender.