William Randal Cremer, originally a trade-union activist, became a Member of Parliament and argued that law and negotiation should replace armed force. In the 1880s he founded the International Arbitration League and pressed for practical steps such as an Anglo-American arbitration treaty. Through speeches and letters he persuaded fellow legislators worldwide and promoted the idea of a permanent court for states. His lobbying helped inspire the 1899 First Hague Peace Conference and the creation of the Permanent Court of Arbitration, milestones in modern international law. He is remembered as a pioneer of "parliamentary diplomacy" whose work also nurtured early disarmament thinking.

At the turn of the 20th century, imperial rivalries made institutional war-prevention urgent. Cremer, influenced by Cobdenite free-trade liberalism, launched a grassroots campaign to weave a network of bilateral arbitration treaties. The International Arbitration League functioned as a pioneering NGO; resolutions passed at its annual meetings were forwarded to parliaments, thereby pressuring governments to negotiate treaties. During the 1890s Anglo-American talks, Cremer conferred directly with the British Prime Minister and U.S. congressional leaders, ensuring that "compulsory arbitration" clauses were included in draft treaties. His work mediated intellectual exchanges between international jurists (e.g., James Lorimer, T.M.C. Asser) and politicians, providing a template for later private peace foundations such as the 1913 Carnegie Endowment for International Peace.

Cremer represents an early instance of norm diffusion via parliamentary networks, illustrating a 19th-century form of transnational advocacy. He engineered the binding-arbitration resolution at the 1890 Inter-Parliamentary Union Brussels meeting, whose wording was later echoed in Article 15 of the Hague Convention. Through league circulars he proposed a taxonomy of interstate disputes (honor, legal, interest) and matched procedures (conciliation, arbitration, adjudication), shaping the proceduralization of interstate conflict. The Cremer Papers in the British Library document the interplay between treaty drafting and lobbying. His civil-society driven arbitration concept arguably anticipates elements of modern Investor-State Dispute Settlement, making his work a valuable subject for socio-legal reassessment.