This chapter seeks to probe the generalizability of the findings outside the Greek context by examining the organizational development of extremist right-wing parties in Germany and Slovakia. Utilizing the analytical framework developed and tested in the previous chapters, this chapter investigates the organizational development of two relatively similar parties in two distinct settings, the German National Democratic Party of Germany and the Kotleba – People’s Party Our Slovakia. The postwar and postcommunist contexts in which the NPD and the LSNS have developed are different from the postauthoritarian setting in which the GD evolved. The main purpose of this chapter is to show that, despite these notable contextual differences, the organizational development of the NPD and LSNS is affected by endogenous and environmental factors similar to those analyzed in Greece. The first section of the chapter briefly describes the basic characteristics of the two parties, highlighting their similarities to and differences from the GD. The second section utilizes interviews with the party leadership, organizational data from official and party documents, and the secondary literature to sketch the organizational development of the German and Slovak parties. The last section examines in turn the endogenous, electoral, institutional and societal factors affecting the development of the two parties.