Answer:
A dagger thrust at my own heart, dictates the way I'm swayed. Left I stand, and right I yield, to the twisting of the blade.
By the way, what never moves, wears shoes, sandals and boots, but has no feet?
You use it between your head and your toes, the more it works the thinner it grows.
Although I'm not an insect, some people found me very difficult to exterminate. They called me something like 'insane priest.' The first half of my name means the same as 'scrape,' & my last three letters are a metal. Who am I?
Though easy to spot, when allowed to plume, It is hard to see, when held in a room.
They are many and one, they wave and they drum, Used to cover a state, they go with you everywhere.