Since the electoral success of the left social-democratic Syriza coalition in Greece, and the immediate challenge to austerity and the rule of finance capital in Europe that it represents, many people are understandably keen to consider how this could be repeated in the UK. While it is clear to everyone that Syriza is not presently a revolutionary outfit and not seeking to become one in the short term, it is equally clear that for a sustained left challenge to the politics of the last few decades to emerge from this countermovement requires a deepening of political organization of the left across Europe. The northern European left has an important role to play here because of the very real possibility of isolating a left confined to Greece alone, or even just Greece, Portugal, and Spain. If we are to break the back of the intellectual coalition between the neoliberal social imagination and the economic policies of austerity and debt enforcement, it is of the greatest importance that the left in the creditor countries makes a priority of making the enforcement of such regimes by their own governments impossible – not just domestically, but internationally. In the current European context, internationalism is not just a desirable principle but an absolute precondition for success.