Letter from R J Pearson, Chief Constable's Office, Borough Police, Cambridge, to the Vice-Chancellor, University of Cambridge, Queen's College Has had instructions from the Undersecretary of State regarding aliens 'who are employed, or who desire to enter, the below mentioned premises'. Lists various laboratories including Cavendish and Strangeways. Would like to bring to their attention the necessity of aliens applying for permits before gaining entry to these laboratories. 7 September 1943