I know most if not all of the sites peddling these "free grants" is obviously fakes, but is it at all possible to get real government grants for minorities? (or any other reason besides social security)

A free grant for what? School? Then yes. If you file a FAFSA you will be considered for student grants. These are usually based on income level more than anything else. Otherwise, contact specific schools you are interested in because they most likely have some form of minority scholarship. However, as mentioned before there are not government grants just for being a minority you have to use them for something, usually college.