Lactivism (a portmanteau of "lactation" and "activism") is the doctrine or practice of vigorous action or involvement as a means of achieving a breastfeeding culture, sometimes by demonstrations, protests, etc. of breastfeeding. Supporters, referred to as "lactivists", seek to protest the violation of International Code of Marketing of Breast-milk Substitutes by formula companies and industry. During nurse-ins, nursing mothers often wear clothing with the International Breastfeeding Symbol on it, to show their solidarity.