The protesters sat or laid down after they were arrested and knew their actions would cause disruption, the court was told.
The judge said: “The traffic on this occasion was barely crawling and brought to a standstill while the arrests were effected.”
Buses were delayed and diversions needed, meaning the impact of the protest had “knock-on effects”.
Bramfitt, 52, Sculthorpe, 38, Plumpton, 70, and Goddard, 60, were each given a conditional discharge.
They were ordered to pay a £26 victim surcharge and £310 costs, – except Bramfitt, whose costs were reduced to £200 after she described herself as “economically inactive” and not receiving benefits.
Bramfitt then shouted at Deputy District Judge Patricia Evans before storming out of court saying: “What you have done is shameful. How do you live with yourself?
“It is shameful, all of you – you are criminalising people who are fighting for your futures. Shame on you, judge.”
Another defendant, 40-year-old Lora Johnson, of Reydon in Suffolk, who was tried in her absence, was found not guilty of the same offence.
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