Control is a type of Mechanism. Regulation is a type of Control. Regulation is related to Government. Government is related to Corruption. 
Unexpected is the opposite of Natural. Natural is a synonym of Native. Native is related to Homeland. 
Mechanism <--IsA-- Control <--IsA-- Regulation <--RelatedTo--> Government <--RelatedTo--> Corruption 
Unexpected <--Antonym--> Natural <--Synonym--> Native <--RelatedTo--> Homeland 