  In the Tetrad Representation of General Relativity, the energy-momentum
expression, found by Moller in 1961, is a tensor wrt coordinate transformations
but is not a tensor wrt local Lorentz frame rotations. This local Lorentz
freedom is shown to be the same as the six parameter normalized spinor degrees
of freedom in the Quadratic Spinor Representation of General Relativity. From
the viewpoint of a gravitational field theory in flat space-time, these extra
spinor degrees of freedom allow us to obtain a local energy-momentum density
which is a true tensor over both coordinate and local Lorentz frame rotations.
