the WWI memorial vandalism in Pittsburgh, was red hammer/sickle (as prior anon mentioned), but it also had a message.
from Officer.com article:
"Police responded before 8 a.m. to find the statue at Doughboy Square covered in red paint and a message: 'June 19, 1986! Glory to the Day of Heroism!' "
sauce: https://www.officer.com/investigations/news/21139554/pittsburgh-war-memorial-vandalized-on-memorial-day
There is significance to this message. It refers to the Peru communist prisoner uprising/riots. The communist party in Peru is named "The Shining Path".
https://en.wikipedia.org/wiki/Peruvian_prison_massacres