Ghosts from Ghosts in the BRST Formalism
  We show that the Hamiltonian HQ introduced in the course of BRST analysis of a gauge theory may in fact be associated with an action that itself is gauge invariant. This action can then be treated using the BRST formalism. We illustrate this by considering the spinning particle and the first order Einstein-Hilbert action in 1 + 1 dimensions. 
D.G.C. McKeon
hep-th