People around the world today are celebrating and demanding worker's rights. As Rinku Sen and Yvonne Yen Liu wrote earlier on Colorlines.com, it's a struggle that's imperfect and ongoing. Nonetheless, today is an occasion to admire the sacrifices of hardworking, everyday people whose lives are often relegated to the margins. And an important part of that process is the visual representation of those struggles. We've collected just a few of the posters that will be dotting today's general strikes and marches to show the centrality of art in the movement for worker's rights.