This study reports the results of qualitative interviews with 28 extreme right wing activists in Flanders (Belgium). We focus on the (ideological) motives for activism (why did they become active?) and the trajectory followed in becoming active (how did they become active?). The results show that these activists are primarily motivated by ethnic nationalism. All other ideological stands (e.g. rejection of foreigners, authoritarian attitudes and rejection of actual politics in Belgium) seem to be derived from this core of ethnic nationalism. The trajectory followed is primarily one that relates to socialization and continuity: most interviewees grew up in a family in which nationalism was of primordial importance. A minority of respondents, however, followed trajectories that refer to compliance or to conversion (deprivation).