However , he gained entry to the Civil Service by claiming to have foresworn Marxism .
As an undergraduate , Maclean openly proclaimed his left - wing views , and was recruited into the Russian intelligence service ( NKVD ) .
Maclean gained entry to the Civil Service by claiming to have foresworn Marxism .
As an undergraduate , Maclean openly proclaimed his left - wing views , and was recruited into the Russian intelligence service ( NKVD ) .