The abattoir workers were nervous. They were in a hotel room with a member of Animal Liberation NSW, the organisation they had phoned anonymously with stories of cruelty from inside the Hawkesbury Valley Meat Processors.

The group planned the covert operation together, deciding where the workers would place pinhole cameras inside the abattoir to capture the beatings, the botched stunnings, and the hung animals - writhing in pain as they bled out.

No names were exchanged, the phone numbers of the workers are untraceable, and their addresses remain a secret. Advertisement: Story continues below

But their video, broadcast first on ABC's Lateline on Thursday, showed sickening cruelty at the hands of abattoir workers, and pushed the state government to announce a review of the operations of all abattoirs in NSW.

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full story:
http://www.smh.com.au/environment/animals/the-cloak-and-dagger-operation-to-expose-cruelty-20120211-1sya8.html