For three weeks and counting, America has raged against the appalling behavior of the local police in Ferguson, Missouri, and for good reason: automatic rifles pointed at protesters, tank-like armored trucks blocking marches, the teargassing and arresting of reporters, tactics unfit even for war zones – it was all enough to make you wonder whether this was America at all. But as Congress returns to Washington this week, the ire of a nation should also be focused on the federal government agency that has enabled so much of the rise of military police, and so much more: the Department of Homeland Security (DHS).