Pledge Union, and started the Peace and Progress Information Service (PPIS) to publish information provided to him by Bohle. Greene tried to connect with anyone who was opposed to war, including fascists, and even joined the British Peoples Party (BPP), becoming its treasurer. In December 1939 Greene ghosted The Truth About the War for the BPP. Attlee saw a copy, and was shocked by its "pro-Hitler" tone and its claims that the Poles had been the authors of their own misfortunes. Greene was a frequent speaker at anti-war meetings, and spoke of the "danger of Jewish and American capitalists". Detention In early 1940 Lord Hampden, in his capacity as Lord Lieutenant of Hertfordshire, approached Maxwell Knight of MI5 and questioned Greene's suitability as a JP. Knight felt that he had no evidence on which to seek the removal of Greene from the post. At the same time Vernon Kell was calling for action against the BPP, in particular for Greene and Beckett's internment under Defence Regulation 18B. The order to detain Greene because of his "hostile associations" was signed on 22 May 1940 and Greene was arrested on 24 May. The "Reasons for Order" cited Greene's membership of the BPP and the British Council for Christian Settlement in Europe, the content of his speeches, his association with Beckett, and his communications with the German government. It also alleged that he desired to establish a National Socialist regime with the assistance of the German Army and had harboured German agents. The more specific "Statement of Case" revealed that these allegations had been made by Harold Kurtz. Kurtz was an MI5 agent who posed as a National Socialist German agent recently released from internment in Britain. Kurtz entrapped Greene with another MI5 agent, Gaertner, as witness, and alleged that Greene had helped him to avoid further internment and clandestinely communicate with Germany, and had told him ways of leaving the country undetected. Kurtz also claimed that Greene had told him that there were "men in this country ready to take over the government after a German victory, men trained in and filled with the proper spirit of National Socialism—a British National Socialism". Greene denied these allegations and claimed that he had reported Kurtz's suspicious behaviour to the police. The police denied Greene's claim. First hearing of the Advisory Committee Greene challenged his detention at the Advisory Committee headed by A. T. Miller