Union is a synonym of Federal. Federal is related to Agent. 
Isolation is the opposite of Context. Context is a type of Environment. Environment is related to Country. you are likely to find Town in/at/on Country. 
Union <--Synonym--> Federal <--RelatedTo--> Agent 
Isolation <--Antonym--> Context --IsA--> Environment <--RelatedTo--> Country <--AtLocation-- Town 