What is an ally?

For all the recent talk of people failing or succeeding as allies to oppressed groups, a well worked out philosophical theory of what it is for someone to be an ally is conspicuously absent. This makes it difficult to evaluate the claims of people failing or succeeding as allies, and consequently diminishes the concept's usefulness to disadvantaged groups by making it difficult to identify who will genuinely help to further their interests. We aim to rectify this absence by answering the following question: what is an ally? On the view that we develop, allyship is a regrettably hierarchical relationship that holds between a privileged individual and an oppressed group, and is formed through a series of actions taken by the privileged individual in a bid to contribute towards bringing that hierarchy to an end.