The group had obstructed a key junction, A282, close to junction 31 of the M25 in Purfleet in the early hours of September 12 in 2021.
Essex Police said that the disruption had a knock-on effect on the M25, A13, A282 and the A20 routes.
Nine protestors were arrested by officers and an investigation was launched. All of them were later charged with causing public nuisance.
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Officers, the Essex Police said, were able to prove that the protestors caused an economic impact of at least £118,000 with about 6,500 hours lost in delays caused to several motorists who were inconvenienced by the protest.
Seven from the group had earlier denied the office but were found guilty on March 7 after a three-week trial at Reading Crown Court. Three of the others had earlier pleaded guilty to the offence.
All of them appeared at the court for their sentencing on Friday (April 19).
Nicholas Till, 68, of Rheidol Terrace in Islington was sentenced to 12 weeks in prison, suspended for 18 months, with 80 hours of unpaid work and £1,500 in costs.
Nicholas Onley, 61, of Richmond Road in Tottenham was given a 12-week imprisonment, suspended for 18 months, with £250 in costs.
Rob Stuart, 42, Chingford Road in Walthamstow was sentenced to 12 weeks imprisonment, suspended for 18 months, with 60 hours of unpaid work and £500 costs.
Janine Eagling, 63, of Tower Hamlets Road in Forest Gate was ordered a 12-week imprisonment, suspended for 18 months, with 60 hours of unpaid work and £1,000 costs.
Detective Sergeant Chris Arnold, who led the investigation said: “These individuals did not need to get criminal records.
“Their actions inconvenienced thousands of people and took up valuable police time; time which would have been better spent catching criminals causing harm in our communities.
“The team faced the challenging investigation head-on and without them and their hard work, we would not have had such a positive result.”
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