asked the Parliamentary Secretary to the Ministry of Economic Warfare, what steps are taken by his Department to prevent persons suspected of hostility to the Allied cause from travelling in neutral vessels from and to Europe?

In order to prevent such persons travelling in neutral vessels, my Department operates a system of passenger and crew control. Before a ship navicert is granted in respect of any voyage to or from Europe the shipping company or its agent must submit a complete list of both passengers and crew to our consular authorities, who refuse permission in the case of any person whose voyage is considered to be undesirable. Doubtful cases are referred to London.