Two leading political organisations in interwar Romania were genuinely anti-Semitic: the fascist Legionary movement and the far-right party the National Christian Defence League (LANC), known from 1935 as the National Christian Party (PNC). Whereas the anti-Semitism of the Legionaries is well researched, that of the LANC/PNC has rarely been studied. I argue that, in addition to an anti-Semitic agenda and rhetoric, anti-Jewish violence was an inherent part of the political practices of the LANC/PNC. I analyse the party's national congress on 8 November 1936, when thousands of supporters gathered in Bucharest, and use party correspondence and police and Interior Ministry records to show that the attendees engaged extensively in anti-Jewish violence, before and even more so after the congress. The government, ruled by the National Liberal Party, agreed to the mass anti-Semitic gathering but had only a vague plan to repress violent anti-Semitism: expecting the event to stir up anti-Jewish hatred, the Interior Ministry mobilised the security forces to prevent outbursts during the congress, but not much before or after. The LANC/PNC played a central role in the politicisation of extreme anti-Semitism in interwar Romania, and addressing the party's history provides a better understanding of the right-wing radicalisation of the time.