"Christmas tree" files

From the 1930s until 1980s, the BBC kept a number of clandestine files on applicants accused by MI5 of political subversion, in particular those deemed to be communists or fellow travellers of communism, and also members of far-right organisations. They were marked with a distinctive upward-facing green arrow, which bore resemblance to a Christmas tree and had the effect of blacklisting a number of applicants for roles in the BBC. Knowledge of the files was made public in 1985 after being reported on by The Observer. By that time, the practice had ceased but a number of files remained. They were destroyed in the 1990s following the end of the Cold War.

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