Hampshire Constabulary made the arrests at properties in Hampshire and West Sussex on Friday.
A 24-year-old man and a woman, 26, were arrested at a house in Alver Road, Gosport. A woman, aged 50, was arrested in Thorncroft Road, Littlehampton.
The three detainees were granted police bail until March.
The arrests were part of Operation Achilles, a police investigation into an alleged conspiracy targeting a variety of organisations and individuals, including Huntingdon Life Sciences in Cambridgeshire.
In May, 30 properties across the UK as well as in Belgium and the Netherlands were raided.
Police said 16 people had been charged and six remained on bail following their actions last year.
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