“The political moment is again open to systemic change, after decades of fragmentation of the struggle. Who are today’s Red Valkyries? Some of them are in the US, fighting for racial justice in the streets or doing squad work in Congress on behalf of exploited populations. Others are in Latin America, mobilizing people for feminist strikes, for safe and legal abortion, and against the violence of international finance institutions. In Europe, they lead struggles for housing justice. In occupied Palestine, they stand up to apartheid. We may not know their names, but we don’t need to. One...