1970 United Kingdom dockers' strike

The docks strike of 1970 was a major industrial action by dockers in the United Kingdom that raised fears of food shortages and led to a proclamation of a state of emergency by Queen Elizabeth II. Dockers went on a national strike over a rejected pay increase which amounted to nearly double the basic pay. Trade links to Britain were severed by 90% after the first two weeks, while the British Army were on standby to protect food imports if necessary.

Source: Wikipedia — 1970 United Kingdom dockers' strike (CC BY-SA 4.0)