This allowed him to continue to keep Moscow informed about Anglo - American relations and planning .
He was promoted and made head of the American Department in the Foreign Office , perhaps its most important assignment for an officer at Maclean 's level .
This allowed Maclean to continue to keep Moscow informed about Anglo - American relations and planning .
He was promoted and made head of the American Department in the Foreign Office , perhaps its most important assignment for an officer at Maclean 's level .