Collocations for protester - noun

student
animal rights (esp. BrE), environmental, peace, political
anti-globalization, anti-government, anti-war, etc.
pro-hunt (BrE), pro-life, etc.
non-violent (esp. AmE), peaceful, unarmed
angry

arrest

call for sth, demand sth
march
demonstrate, gather
clash, fight
Protesters clashed with police outside the embassy.

protester against
The streets were crowded with protesters against the war.