Seven animal rights activists who conducted a six-year campaign against companies with links to an animal testing laboratory in Cambridge were on Wednesday sentenced to between four and 11 years in prison.
From 2001 to 2007, they targeted firms across Europe that had either supplied Huntingdon Life Sciences (HLS) or had secondary links with the company in a bid to force it to close.
The seven were found guilty of conspiracy to blackmail by Winchester Crown Court, southern England, last month.
During sentencing, judge Neil Butterfield described the campaign as "urban terrorism" and a "relentless, sustained and merciless persecution" which made victims' lives "a living hell".
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