tactic used by left-wing protesters who wear black clothing and masks; used to conceal wearers' identities from the police and politically opposing organizationg, protect from the pepper spray and making group look like large unified mass
A black bloc group participating in a march near the World Bank, in Washington, DC, in 2009. Some black bloc protesters wear hoods, allowing their faces to be viewed, while others use such items as scarves, dark sunglasses or masks to conceal their faces as much as possible.
Theory and practice
Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).