Library and information science researchers, practitioners, educators, social justice advocates, and community leaders from the US offer nine essays on the role of critical theory and social justice in library and information science, and how it can create actions that result in positive change in communities. They present critical theories in library and information science, such as behaviorist-oriented big data collection and a framework of socially generated information, and cases of progressive community action that engage with critical theory and social justice in the context of libraries, classrooms, a library professional association, and a museum, in terms of environmental justice, inequality and privilege, youth development, rural libraries, and other topics. Annotation ©2016 Ringgold, Inc., Portland, OR (protoview.com)