Mandatory Credit: Photo by Paco Freire/SOPA Images/Shutterstock (11885644j) A protester seen carrying a lit smoke canister during the demonstration in Passeig de Grrcia. Hundreds of people called by parties, unions in social organizations of the left have demonstrated in Passeig de Grrcia to commemorate International Worker's Day. International Workers' Day commemoration in Barcelona, Spain - 01 May 2021