Comment: Note: this is written in the present tense because it's from The Guardian's archive and was published in 1971.
The Foreign Office is to expel 90 Soviet diplomats who have been spying for Russia, after a KGB defector revealed sabotage plans
Britain is to expel 90 Soviet diplomats who have been engaged in active espionage, the Foreign Office announced last night. Another 15 Soviet officials, at present overseas, will not be allowed to return to this country. Many of these men are suspected of involvement in planning acts of sabotage.
The expulsion order - affecting nearly 20 per cent of the 550 Soviet diplomats in Britain - is unprecedented in size and scope. It follows months of intensive investigation by the intelligence services, and the defection of a top KGB officer from the Soviet Embassy in London.
The KGB man, who had the rank of major, proved the catalyst for the "clearing" operation against Soviet espionage. He gave the security services a comprehensive breakdown of his country's espionage apparatus in Britain - and also supplied details "of plans for infiltration of agents for purposes of sabotage", the Foreign Office said.
Comment: The total number of Russians expelled was actually 105: See also: Cold War continuum: The long history of US-Russian expulsion of diplomats