If Israel is a colonial project, any relationship fueling its economy is supporting the war. This includes touristic activities, investments, any kind of business.
The BDS movement worked against South Africa because it was totalizing and any chance to suffocate the Israeli colonial project must go through the same strategy.
There are no leftist parties in Italy. You could only pick between mild neoliberal, full neoliberal, old-school liberal and a few different flavors of proto-fascists.
Unions in Italy are the only bastion of the left wing, especially now that Landini decided he’s not a wishy-washy institutional moderate anymore and he wants to enter Valhalla dying in battle.