A woman who waged a five-year blackmailing campaign of animal rights extremism against companies and individuals in the UK has been jailed.
Darley Oaks Farm closed in January 2006
Deborah Morrison, 35, from Dorchester, Dorset, pleaded guilty to 12 offences which included six charges of blackmail at Stafford Crown Court last October.
The offences involved sending threatening letters and emails. She has been jailed for eight months.
One firm she targeted had links with Darley Oaks Farm in Newchurch, Staffs.
Darley Oaks Farm bred guinea pigs for research until January 2006.
Morrison sent dozens of emails and letters - some containing white powder - to individuals and companies which had, or used to have, connections with animal research organisations, Staffordshire Police said.
Morrison also pleaded guilty to one charge of attempted blackmail, three charges of interference with a contractual relationship so as to harm an animal research organisation, and two charges of attempting to interfere with contractual links to animal research organisations.
Insp David Bird, head of the Staffordshire Police's public order and protest unit, said: "Morrison sustained a widespread campaign of intimidation over several years.
"She sought to cause financial loss to companies engaged in lawful business, and caused genuine fear for dozens of staff and their families.
"The use of white powder was sinister and led to at least one person going to hospital to make sure they hadn't come into contact with anything dangerous."