"Key ally" refers to a person or entity that is very important and supportive to someone or a group in achieving their goals and ambitions. Full definition
Principals are also key allies in your quest to create a better school lunch; they often control the funds and decision - making for dining room improvements. (saladbars2schools.org)
Also, note that agreement on metrics and check - ins is essential both with your direct reports and key allies across the organization. (fortune.com)
In sum, executive search consultants can be key allies in helping you identify potential opportunities. (bluesteps.com)