“Genocide” became an option to codify the Martens Clause when Axis Rule was published in late 1944. But “war crimes,” “crimes against humanity,” and “crimes against peace” were the favored options among Allied authorities in the first half of the 1940s. Genocide’s breakthrough as a politically viable legal concept was dependent less on Lemkin’s well-known energetic advocacy than on its repositioning in a field of conceptual options over which he had no control. Lemkin’s achievement was not to invent a “new word … to denote an old practice in its modern development” but to contrive a conceptual artifice that enabled a new coalition of small states and civil society groups like the WJC to create a new reality by combining the “crippling” and “extermination” of nations after the disappointing outcome of the Nuremberg Trials in 1946. In doing so, he introduced definitional instability into the concept. Genocide’s redefinition in the UN Convention negotiated between 1947 and 1948 made the Holocaust the archetype of genocide.