The disproportionate historical contribution of Jews to the political Left has been well documented. It can in fact be argued that from approximately 1848 till 1970, an informal political alliance existed between Jews and the political Left. This was never an alliance of all Jews and all Left groups. But it was an alliance between key sections of the Left and key sections of politically active Jews at various times and in various places. Both partners to this alliance were motivated by a combination of pragmatic self-interest and idealism or altruism.