When we think of the jamming of broadcasts we would normally associate such practices with cold-war politics and despot nations. So it may surprise you to know that politically-motivated jamming has occurred in New Zealand.
The year is 1935, Colin “Uncle Scrim” Scrimgeour a well-known broadcaster and Methodist minister implored the masses to vote for the opposition Labour party in the upcoming election. The jamming was carried out at the behest of the then Minister of Broadcasting in the governing National Party and rumour has it an amateur radio operator and civil servant provided the necessary skill to do so.
More on this intriguing topic and the life of this iconic broadcaster can be found on Te Ara Encyclopaedia of New Zealand.