History: In 1947 Canada raised the price of chocolate bars from 5¢ to 8¢ without much notice. Children protested against this 62.5% increase throughout the country, and approximately 200 stormed the legislature building of British Columbia.

via wikipedia:

The candy bar protest, also known as the 5 cent chocolate war, the 5 cent war and the chocolate candy bar strike,[1] was a short-lived 1947 protest by Canadian children over the increase in price of chocolate bars from five to eight cents.[2][3] The strike began in Ladysmith, British Columbia, and spread across the country to include protests in Calgary, Edmonton, Winnipeg, Montreal, Quebec City, Ottawa, Toronto and the Maritimes.[4] The strike ended when the Toronto Evening Telegram published an editorial suggesting that one of the organizations allied with the children, the National Federation of Labour Youth, was backed by communists.

Timeline
Origins
On April 25, 1947, Canadian manufacturers of chocolate bars raised their prices from five cents per bar to 8 cents, citing increasing production costs.[5][6][7] In particular, manufacturers cited problems with the cocoa bean supply and the elimination of wartime government subsidies as the reason for the price increase.[8]

The strike began on the same day in Ladysmith, British Columbia, at the Wigwam Cafe, a confectionery store and luncheonette.[7][9][10] Shocked by the 60% price increase of the Wigwam’s chocolate bars, of which there had been no advance notice, children organized a protest in front of the store, calling for a boycott of the bars, and adopting the slogan Don’t be a sucker.[9] They staged their initial protest using a slogan-covered 1923 black McLaughlin Buick, which was followed by 40 protesting children.[9][10][11] As they marched, the children sang:[4][7]: 3

We want a 5 cent chocolate bar
8 cents is going too darn far
We want a 5 cent chocolate bar
Oh, we want a 5 cent bar.

They protested for three noon-hours in a row, and were reported by the local newspaper, the Ladsysmith Chronicle.[11] Carrying homemade signs, some of which read DONT BUY 8¢ BARS. LOWER PRICES TO 5¢. WE ARE SMART and LET THE SUCKER PAY 8¢ WE WON’T, the children also posed for a Vancouver Sun newspaper photographer.[9][12] The Sun ran the story and photograph on April 26.[12]

h/t throwaway