Here’s one of my favourite international working class solidarity and sabotage stories, it’s very short.

In Madrid during the Spanish civil war they came across an unexploded shell - a German shell, made in the Ruhr valley. Approaching it carefully, on closer inspection they saw that it had words written on it. Those words were “Comrades! The shells I make do not explode!”

They put it on display in a shop window and people cued round the block to see it.