I worked over a decade for the FBI before becoming a federal prosecutor, and I can tell you there are two sorts of people working for the federal government who would be powerful allies. Ig that how you earned your name? Frst, there are the crusading civil rights types. These are the guys who started working for the government specifically because they wanted to investigate things like violations of anti-discrimination laws, big companies stepping on the little guy, and police abuses. Also, look for non-government organizations that do the same thing. This is a great time because those organizations are at the height of their power. Usually public support is split because conservatives tend to be very pro law enforcement, and they don't like the big civil rights organizations like the ACLU because these organizations don't fight for Second Amendment rights, and conservatives don't agree with defending a "criminal's rights". But today, the police are "Obama's police," and thanks to the PRISM scandal, even people on the right are starting to realize that it's not just criminals who get caught up in police investigations. The net result is that it's become easy to find an NGO that is non-partisan or at least matches your politics that is willing to help hold the police to account, and they enjoy more widespread support.