13 people have been sentenced in connection with a 2022 protest at a dairy distribution centre on Mosquito Way, Hatfield, causing around £100,000 worth of damage.
Several members of the protest group Animal Rising (then known as Animal Rebellion) broke into the centre.
Following an investigation, officers from Hertfordshire Constabulary’s Public Order Crime Team arrested and charged 14 people with conspiracy to cause criminal damage.
One of these left the country following the expiration of their visa, and an arrest warrant remains outstanding.
St Albans Crown Court heard how some of those who entered the site used cordless drills to make holes in the tyres of lorries waiting at the yard, and bolt cutters to cut off the air valves in what was described as a "planned and deliberate" incident.
Eight people pleaded guilty to the offences and were sentenced across two hearings on Wednesday, July 31, and Monday, August 5.
The following sentences were given:
Five people pleaded not guilty to the offences and were convicted by a jury following a three-week trial.
The following sentences were given at St Albans Crown Court:
Five further suspects were arrested in connection with the incident but failed to answer their bail having fled to the Czech Republic, and their arrest warrants remain outstanding.
Insp Donna Norris, from Hertfordshire Constabulary’s Public Order Crime Team and senior investigating officer, said: “The sentences passed down by the courts are a culmination of nearly two years’ worth of work in what has been a challenging and complex investigation.
“These 13 defendants turned up at a dairy distribution centre and caused tens of thousands of pounds worth of damage.
"They were protesting around climate change and animal welfare and, regardless of your views on the topic, this does not mean you can take the law into your own hands and damage property belonging to others."
Norris said this was a "pre-planned incident", with much of it filmed and posted on social media.
“I hope these sentences will reassure the public that we will deal with matters such as these seriously, and that offenders will be brought to justice.”
The judge also awarded a commendation to Insp Norris and her colleague DC Chris Aherne for their work throughout the complex case.