Mandatory Credit: Photo by Paco Freire/SOPA Images/Shutterstock (11885644o) Protesters holding a banner with the slogan Let's go on the offensive in view 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