Quite a few flying saucer reports from the 1960s mention 'hooded men', the following report appeared in Flying Saucer Review, September-November 1963, Volume 9, No.5.
Events in England are beginning to resemble the pattern in France
in 1954 which led to the discovery of orthoteny although the incidents
that revealed the pattern appeared at the time to be most
incredible. This story is taken from the front page of the
Caterham Times, August 2:
"Hooded men were seen on Sunday morning (July 28) at Wapses Lodge, Caterham. A group of eight men wearing thick black cowls caused alarm and astonishment to passing motorists.
"One motorist told our reporter: 'The hooded figures gave me a great shock. I thought I had stumbled on the Klu Klux Klan.'
Reports indicate that the mystery men departed 'running and leaping across the road to the dual carriageway.' But all their actions were 'silent and most odd.'
Efforts to trace the mystery men have been so far unsuccessful."