Question: Speedy Delivery, Inc. is a local parcel delivery service. Its drivers are represented by Local 33 of the Service Employees International Union. The Teamsters Union, Local 747 approaches the manager of Speedy Delivery and demands that the company recognize it as the bargaining representative for its employees. When the manager refuses, the Teamsters begin picketing around Speedy Delivery's warehouse and garage. The picketing causes several UPS and FedEx truck drivers to refuse to make deliveries to Speedy Delivery. Does the Teamster's picketing violate the NLRA? If so, which section? Why?