A forgotten, dark chapter of American history with implications for the current day, THE GUARDED GATE tells the story of the scientists who argued that certain nationalities were inherently inferior, providing the intellectual justification for the harshest immigration law in American history. Brandished by the upper class Bostonians and New Yorkers --- many of them progressives --- who led the anti-immigration movement, the eugenic arguments helped keep hundreds of thousands of Jews, Italians and other unwanted groups out of the US for more than 40 years.