What's the adjective for alliance? Here's the word you're looking for.
Included below are past participle and present participle forms for the
verbs alliance and ally which may be used as adjectives within certain contexts.
“He uses them as an opportunity to effectively endorse propaganda techniques against allied nations.”
“This group was not a cartel in the traditionally defined economic sense, but rather an allied group of independent family-based trafficking organizations.”
“Unlike medicine and allied professions, psychotherapy has established itself primarily outside the state sector.”