  The D1-D5 system is believed to have an `orbifold point' in its moduli space
where its low energy theory is a N=4 supersymmetric sigma model with target
space M^N/S^N, where M is T^4 or K3. We study correlation functions of chiral
operators in CFTs arising from such a theory. We construct a basic class of
chiral operators from twist fields of the symmetric group and the generators of
the superconformal algebra. We find explicitly the 3-point functions for these
chiral fields at large N; these expressions are `universal' in that they are
independent of the choice of M. We observe that the result is a significantly
simpler expression than the corresponding expression for the bosonic theory
based on the same orbifold target space.
