Tomorrow, there is a strike action of many of the public transport in France (national trains, city buses, metros and tramways). Mainly drivers will protest against the government's project to erase special retirement treatment that benefits public transport drivers.
Some philatelists specialized themlselves in the alternative way of sending mail, while there is a postal strike.
Concerning France and some neighbouring philatelix countries (like the Channel Islands), you can search the bibliography added to the Wikipédia in French article about these stamps and labels that symbolised a effective or imaginary service replacing the defailling State postal monopoly.
Concerning your discovery of French strikes, the big last one (Autumn 1995) makes my fellow citizens discover bicycles of course, and what has been the gadget of the late 1990s : the kick scotter.