Activity is related to Protest. Protest is related to Campaign. 
Engage is a type of Fight. Fight is related to Contest. Contest is a synonym of Contend. Contend is a synonym of Argue. 
Activity <--RelatedTo--> Protest <--RelatedTo--> Campaign 
Engage --IsA--> Fight <--RelatedTo--> Contest <--Synonym--> Contend <--Synonym--> Argue 