The teacher's union has found an unlikely 'ally' in the company. [=the company supports the position that the union has taken and this was not expected]
He'll even admit that he's hoping to 'ally' himself 'to' a wealthy family by marriage.
countries 'allying' themselves 'with' the EU
(..) In the first games, I thought you were trying to help the careers kill me. After that, I always saw you as an ally. Friend, lover, Victor, fiancee, enemy, target, mutt. And now ally? (..)2015 The Hunger Games: Mockingjay - Part 2