Ss measuring high or low on the Rotter (1966) I-E Scale were given or denied information about outcome and then asked to aggress against themselves or another unknown S. It was reasoned that the Self for internals and Others for externals (i.e., the perceived locus of control) would be regarded as appropriate aggression targets. Results indicated that internals treated themselves much as externals treated Others (appropriate targets). When the target was inappropriate, internals and externals again reacted similarly but in a very different manner from their reactions to appropriate targets. If success or failure information was provided, aggression against appropriate targets was low and apparently inhibited since these Ss reported high levels of anger following the opportunity to aggress. In the absence of outcome information, appropriate targets received high levels of aggression which apparently drained off some hostility since these Ss reported low levels of anger following aggression. In the case of inappropriate targets, both manifest aggression and reported anger fell between the above extremes irrespective of the information provided Ss.