Joe McCarroll co-founded, and was Chairperson of the Pro Life campaign until December 2015. In 1993, as national secretary of Family Solidarity, he campaigned against the decriminalisation of homosexuality, calling it "unnatural", In 2015, in the lead up to the marriage equality referendum, he campaigned against it, and called for a no vote. Writing in The Brandsma Review after the referendum that approved same-sex marriage), he accused the media of lying, and complained about funding from outside the State.