A protest march is a DEMONSTRATION of public opinion, usually organized by a group of people to express their grievances or demands. The term 'protest march' is often used in conjunction with the term 'demo, ' which is a shortened form of the word 'DEMONSTRATION.' A demo is a public gathering of people to express their views on a particular issue. In this crossword, the solution for the term PROTEST MARCH is DEMO, which is a four-letter word.