From Wiktionary, the free dictionary
From counter- + coalition.
countercoalition (plural countercoalitions)
- A coalition founded in order to oppose another coalition.
2007 November 4, Randall Stross, “Why Google Turned Into a Social Butterfly”, in New York Times[1]:If Facebook chooses to remain a holdout, it will not be as the head of a countercoalition but as a cranky recluse.