http://verdantlabs.com/politics_of_professions/This is totally based off of campaign contributions, so who knows if it's an accurate measure, but here "Law enforcement" is just barely Republican (51-49) and "Investment banking" is just barely Republican (53-47).
The investment bankers I imagine give to Democrats so frequently only because they all live in overwhelmingly democratic cities, however, and actually have the views of a "rockefeller republican." This is how people like Lloyd Blankfein and Jamie Dimon will describe themselves.
Law enforcement is going to be extremely democratic in the cities and is a unionized profession that is going to have left of center economic views. However, it's extremely male and is probably going to have hawkish views on crime, foreign policy, and conservative views on social issues.