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tory and thie Jed ta.action in each case. As already stated Maclean was recalled {vom Cairo in 1950 and was not re- employed until he was declared medically fit. Burgess was re- called from Washington in 1951. and was asked to resign. It w only shortly before Maclean disappeared that serious suspie cion of his veliabibity aroused and active enquirie: wore set on foot. The second question is how Maciean good their and Burgess made escape from this 'y when the security au- les Were on their track. The watch on Maclean was made difficult by the need to ensure that he did not become aware that he was under ob- servation. This watch was primarily aimed at collecting, if possible, further information and not’ at preventing an escape. In imposing it, a caleu- lated risk had to be taken that he might become aware of it and might take flight. it was inadvisable to increase # yy extending the sur- this risk veillance to his home in an isolated part of the country and he was therefore watched in London only. Both men were free to go abroad at any time. In some countries no doubt Maclean would have been ar- vested first and questioned afterwards, In this country no be made without adequate evidence. At the tima there was insufficient evidence. It was for these reasons neces- sary for the security authorities to embark upon the diffiewt and delicate investigation of Maclean, taking into fui ace count the risk that he would be alerted. In the event howe: alerted” amr—#ed the country together with Burgess, arrest can