Edwin G. 
People protesting in Montréal’s CBD with green onions in their hands‽ What’s that all about‼
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Des gens qui protestent dans le centre-ville de Montréal avec des oignons verts dans leurs mains‽ Mais c’est quoi ça‼
Jean-François Mezei@EdwinG Interesting, In the old days, "green onion" refered to those people ticketing cars who hadn't paid their parking meter. They were dressed in green instead of blue for police.
Apparently this protest is about federal/provincial cuts in education.