Step 1: A Bit of Background and Materials List
The Fingermen, being secret police, do not have uniforms. They do however have badges and guns. Leaving the gun part to you, this is how to make the badge.
~Cardboard (a flap from a cardboard box is plenty)
~Red, blue, and silver Sharpies
~A glue of some sort (unless you're a Gorilla Glue god, then I would stick to wood or school glue)
~Ruler and pen(cil)
~Scissors and/or X-acto