Scheme is a synonym of System. System is related to Government. Government is related to Criminal. 
Strict is the opposite of Soft. Soft is the opposite of Harsh. Harsh is related to Punishment. 
Scheme <--Synonym--> System <--RelatedTo--> Government <--RelatedTo--> Criminal 
Strict <--Antonym--> Soft <--Antonym--> Harsh <--RelatedTo--> Punishment 