Beginning in the 1870s and 1880s, many British companies relied on transnational business networks and global associations. However, the tensions produced by World War I created an environment in which consumers, journalists, and politicians actively promoted economic protectionism and consumer nationalism through various Buy British movements. Entrepreneurs under scrutiny took a variety of approaches to manage this hostile environment and avoid the financial, political, and cultural ramifications of suddenly having their and their family members’ valid citizenship questioned and outright attacked in the public sphere. During the war, neutral, passive, or absent patriotism drew suspicion. Any suspicions about loyalty could spark an avalanche of attacks, with each one being exponentially more difficult to defend as fear built in people’s minds. Citizenship was more than a legal matter; it was a layered set of dynamic activities and enterprises in which corporate actions became tied to expression of loyalty. People were judged by their cultural behavior, political associations, legal citizenship, and business decisions. I argue that some firms reacted by defining themselves, their products, and their services as “British,” erasing their “foreignness” as a defense against attacks on their citizenship and loyalty.