  The aim of this paper is to correct a mistake in earlier work on the
conformal invariance of Rarita-Schwinger operators and use the method of
correction to develop properties of some conformally invariant operators in the
Rarita-Schwinger setting. We also study properties of some other
Rarita-Schwinger type operators, for instance, twistor operators and dual
twistor operators. This work is also intended as an attempt to motivate the
study of Rarita-Schwinger operators via some representation theory. This calls
for a review of earlier work by Stein and Weiss.
