united front
/jʊˌnʌɪtɪd ˈfrʌnt/noun
1An appearance or show of unity; a group of people united in a common cause and presenting such a show of unity.
- In early use probably not a fixed collocation..
2Chiefly with capital initials. (The name of) any of various, especially communist, alliances or coalitions; specifically = Popular Front.
Origin
Early 19th century; earliest use found in Literary Panorama. From united + front.