In recent times lots of this type of graffiti and street art in support of ethnic, racial, and social justice issues has been produced. This work may be generic, like profanity laced tags against political leaders (e.g., Fuck Trump), etc., or it may involve more detailed and complicated types of communication including with different colors, shapes, and sizes, etc.
This whole cavalcade of icons, images, lettering, symbols, and words begs numerous interesting questions such as who is doing this kind of work? what is the range (e.g., what particular subjects do writers and artists focus on)? what effect (or impact) does it have? etc.