Primary boycott is a form of organized protest that is being done by cutting the flow of consumers toward a certain company. This is aimed to eliminate company's income until they're willing to have a conversation with the protesters.
This can be done by forcing the members of the group to stop purchasing a certain product, influence the public to purchase the company's product, or in a certain capacity physically prevented the customers from entering the business establishment (such as chaining themselves up in the company's front door)
It would be Nemo because that's who Dory is giving the leaf, or the direct object, to. You can think of it as the indirect object bouncing back from the direct object.