"Neither Hitler nor Mussolini took the helm by force, even if they used force earlier to destabilise the liberal regime, and later to transform their governments into dictatorships. They were invited to take office as head of government by a head of state in the legitimate exercise of his official functions, on the advice of his conservative counsellors,under quite precise circumstances: a deadlock of constitutional government (produced in part by the polarisation that the fascists abetted); conservative leaders who felt threatened by the loss of their capacity to keep the population under control, often at a moment of massive popular mobilisation; an advancing Left; conservative leaders who refused to work with that Left, and who felt unable to continue to govern against the Left without further reinforcement."