For 35 years, the Billboard Liberation Front have been altering public advertisements in San Francisco under the cover of night, strategically changing words or phrases to invert the intended message of corporate sponsors. Considering their guerrilla reclamation of public space an "improvement of outdoor advertising," the BLF regards the advertisers whose billboards they improve as clients, for whom they are performing a vital service.
Brandalism, an organization out of the UK that aims to reclaim public spaces from advertisers, used Black Friday to protest "partner" brands to the COP21 Climate Conference.
Anonymous artists contributed subvertisements that criticized these brand for their hypocrisy in saying they are advocates for the environment when more often than not they are the worst contributors to the problem.