In this special issue we seek to document and learn from exemplars from around the world of interventions and other forms of applied work in organisational, community, and everyday social settings that are aimed at producing social change and changing oppressive social and cultural realities. This introduction presents the colonial origins of oppression and strategies for building social change based on radical solidarity. Colonialism, violence, and social inequality are interconnected. We realize that it is urgent to generate solitarily social change to transform these historical and transnational realities of oppression. Social change is realized through the praxis developed in historically deprived community contexts, respecting individuals' cultural and identity characteristics. Radical solidarity is necessary to question possible practices of colonial tutelage of communities. Likewise, praxis for social change must be developed creatively at the various levels of action and respect the intersectional trajectories of groups and individuals. We present diverse praxis experiences for social change in different contexts and levels of action developed by community psychologists, seeking to build a network of radical solidarity focused on dismantling colonial power.