agents in F Section, for example, ranged from aristocrats such as Polish-born Countess Krystyna Skarbek, and Noor Inayat Khan, the daughter of an Indian Sufi leader, to working-class people such as Violette Szabo and Michael Trotobas, with some even reputedly from the criminal underworld. Some of them were recruited by word of mouth among the acquaintances of SOE's officers, others responded to routine trawls of the armed forces for people with unusual languages or other specialised skills. In most cases, the primary quality required of an agent was a deep knowledge of the country in which he or she was to operate, and especially its language, if the agent was to pass as a native of the country. Dual nationality was often a prized attribute. This was particularly so of France. In other cases, especially in the Balkans, a lesser degree of fluency was required as the resistance groups concerned were already in open rebellion and a clandestine existence was unnecessary. A flair for diplomacy combined with a taste for rough soldiering was more necessary. Some regular army officers proved adept as envoys, although others (such as the former diplomat Fitzroy Maclean or the classicist Christopher Woodhouse) were commissioned only during wartime. Several of SOE's agents were from the Jewish Parachutists of Mandate Palestine, some of whom were émigrés from countries in Europe. Thirty-two of them served as agents in the field, seven of whom were captured and executed. Exiled or escaped members of the armed forces of some occupied countries were obvious sources of agents. This was particularly true of Norway and the Netherlands. In other cases (such as Frenchmen owing loyalty to Charles de Gaulle and especially the Poles), the agents' first loyalty was to their leaders or governments in exile, and they treated SOE only as a means to an end. This could occasionally lead to mistrust and strained relations in Britain. The organisation was prepared to ignore almost any contemporary social convention in its fight against the Axis. It employed known homosexuals, people with criminal records (some of whom taught skills such as picking locks) or bad conduct records in the armed forces, Communists and anti-British nationalists. Some of these might have been considered a security risk, but no known case exists of an SOE agent wholeheartedly going over to the enemy. The Frenchman, Henri Déricourt, is widely regarded as a traitor, but he was exonerated