A 34-year-old woman is to appear in court accused of 15 offences linked to alleged animal rights extremism.
Darley Oaks Farm closed in January 2006
The woman, from Dorchester in Dorset, was charged by Staffordshire Police on Wednesday and bailed to appear at Burton-on-Trent court on 6 July.
She faces 11 charges of blackmail or attempted blackmail and four of interference with contractual links to animal research establishments.
The alleged offences involve sending threatening letters and emails.
Most of the alleged victims had connections with animal research organisations.
One of the companies had links with Darley Oaks Farm in Newchurch, Staffordshire, which bred guinea pigs for research until January 2006.