Widewalls is an online magazine and art marketplace (it includes an art auction). It is interested in contemporary art, with a strong emphasis on art with political, social, or activist themes.
Widewalls has a wide selection of what they call ‘socially engaged’ art, from Russia to 9/11. (I use inverted commas because others use ‘Socially Engaged’ in a different way – the Tate defines Socially Engaged Art as being art which engages with local communities.
https://www.widewalls.ch/how-artists-react-to-trump/
https://www.widewalls.ch/magazine-category/socially-engaged-art/