At a time when educators are increasingly rising up within and beyond their unions to protect public education, it is vital to understand how activist educators become politicized and how their activist organizations contribute to such political education efforts. In this article, Maton and Stark examine the grassroots organizing work of three educator-led social justice caucuses and a national network in order to explicate how five forms of political education--relational, structured, situational, mobilized, and networked--support educators' political learning within and beyond their unions. We tease apart the characteristics and central knowledge sources inherent to these five forms of political education, showcasing examples of how caucuses capitalize upon and embed political education within their change-making efforts.