31 March 1955
Source:
BG A60/60
On March 31, 1955 4000 employees of the Amsterdam tramways go on strike for higher wages. It's an unofficial strike. Being public servants, it was prohibited to strike. Their employer, the mayor of Amsterdam, makes this very clear by sending a letter, threatening them with dismissal. The strikers persevere and not before 5 days they end the strike with the promise that wages will be reconsidered.