John William Wallace "Wal" Campbell (27 November 1906 – 4 July 1979) was an Australian anti-Catholic journalist and refrigeration mechanic.
During his service in the Middle East, Campbell came to believe that Syrian Catholic priests had betrayed Allied forces after observing a man signalling from a monastery window, instilling in him the anti-Catholicism that would characterise the rest of his life.
[1] In January 1945 Campbell began publishing The Rock, a "brash eight-page tabloid", reporting on supposed corruption, sex scandals and intrigue inside the Catholic Church.
Although it had considerable influence during the debate on government funding of religious schools, and in particular during the Labor Split of 1955, the paper gradually declined, especially after Vatican II.
He was arrested in 1978 after a disturbance at the Royal Prince Alfred Hospital in Sydney, and he found himself out of place in a more modern world.