censorship

... Chaplains who fall into the hands of the enemy Power and who remain or are retained with a view to assisting prisoners of war, shall be allowed to minister to them and to exercise freely their ministry amongst prisoners of war of the same religion, in accordance with their religious conscience. They shall be allocated among the various camps and labour detachments containing prisoners of war belonging to the same forces, speaking the same language or practising the same religion. They shall enjoy the necessary facilities, including the means of transport provided for in Article 33, for visiting the prisoners of war outside their camp. They shall be free to correspond, subject to censorship, on matters concerning their religious duties with the ecclesiastical authorities in the country of detention and with international religious organizations. Letters and cards which they may send for this purpose shall be in addition to the quota provided for in Article 71. ...

... Prisoners of war shall be allowed to send and receive letters and cards. If the Detaining Power deems it necessary to limit the number of letters and cards sent by each prisoner of war, the said number shall not be less than two letters and four cards monthly, exclusive of the capture cards provided for in Article 70, and conforming as closely as possible to the models annexed to the present Convention. Further limitations may be imposed only if the Protecting Power is satisfied that it would be in the interests of the prisoners of war concerned to do so owing to difficulties of translation caused by the Detaining Power's inability to find sufficient qualified linguists to carry out the necessary censorship. If limitations must be placed on the correspondence addressed to prisoners of war, they may be ordered only by the Power on which the prisoners depend, possibly at the request of the Detaining Power. Such letters and cards must be conveyed by the most rapid method at the disposal of the Detaining Power; they may not be delayed or retained for disciplinary reasons. ...

... The examination of consignments intended for prisoners of war shall not be carried out under conditions that will expose the goods contained in them to deterioration; except in the case of written or printed matter, it shall be done in the presence of the addressee, or of a fellow-prisoner duly delegated by him. The delivery to prisoners of individual or collective consignments shall not be delayed under the pretext of difficulties of censorship. ...