Abstract
We study here the origin of the torsion term in Einstein-Cartan action of gravitation and show that this is associated with the internal helicity which gives rise to the internal symmetry of hadions. This internal helicity appears here as an effect of dilatation and is related with the supersymmetry algebra generated by the anti-commutator of two eight-component conformal spinors. When the internal variable responsible for this dilatation is written in twistor formalism to explicitly show the helicity, the total space appears as a superspace. The torsion term then corresponds toN=1 supergravity which plays a very predominant role in the microlocal region of space-time.
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