Fear is the opposite of Brave. Brave is a type of People. People is related to Meeting. Meeting is related to Join. 
Legal is related to Protest. Protest is related to Disagree. Argue entails/necessarily involves Disagree. Argue is a synonym of Fence. 
Fear <--Antonym--> Brave --IsA--> People <--RelatedTo--> Meeting <--RelatedTo--> Join 
Legal <--RelatedTo--> Protest <--RelatedTo--> Disagree <--Entails-- Argue <--Synonym--> Fence 