Oaxacan street art addresses a variety of social justice themes, seeking to give voice to the disenfranchised. Check out these links:

Bike street art tour: https://www.youtube.com/watch?v=xzwohVpN780 

https://peekingduck.co/a-street-art-guide-to-oaxaca-mexico/

https://www.wheregoesrose.com/oaxaca-street-art-guide-map/

https://www.aljazeera.com/features/2017/3/26/oaxacas-revolutionary-street-art