the.com/united front

means A unified stance presented by groups or people who set aside their differences to pursue a shared goal, usually against a common opponent.

from The phrase gained its modern political charge from 20th-century Communist strategy — the 'united front' tactic of allying with other parties or classes (even rivals) against a bigger shared threat, most famously fascism. 'Front' here borrows its military sense: a line where allied forces stand together facing an enemy. The term spread into everyday English for any coalition of convenience, where the alliance is real but the harmony is mostly theater.