Why do local party organizations succeed in some settings but fail in others? The purpose of this chapter is to start providing explanations for the varied trajectories of subnational party organizations. This chapter looks at how endogenous factors affect local organizational development. The first part of this chapter seeks to utilize insights from the broader literature on political parties and the extant literature on far right parties to analyze how endogenous (party-specific) factors might account for variation in local organizational outcomes. It focuses on two characteristics of extremist right-wing parties that affect their development: they are charismatic and movement parties. The remainder of the chapter utilizes insights from dozens of interviews with Golden Dawn functionaries and thousands of party documents to trace how endogenous factors affected the trajectory of local party branches. The second section looks at factors that are specific to the national party and the third section examines whether organizational outcomes are endogenous to the local units themselves.