Ok here is a extremely simple, yet extremely effective homemade flail.
Now that you have those two extremely hard to find ingredients, here are the extremely complicated instructions:
Put the rock into the sock. Grab the sock by the open end, swing it around your head while screaming in anger, and repetitively bash it into your chosen government officials face.
Also, I take absolutely no responsibility, blah blah blah, *insert more legal stuff here*, amen.