The term 'strong protest' can be summarized as an 'OUTCRY' (6 letters). An OUTCRY is a loud and passionate expression of disapproval or dissent, often in the form of a demonstration or rally. It is a way for people to express their dissatisfaction with a situation or policy, and to demand change. Outcries are often seen as a form of civil disobedience, and can be used to draw attention to a cause or issue.