Trenton Oldfield, of Myrdle Street, east London, who was also ordered to pay £750 costs, was watched by millions of television viewers as he halted the annual race on the Thames between Oxford and Cambridge universities on April 7.
He was found guilty at London’s Isleworth Crown Court last month of causing a public nuisance and returned to the same court yesterday to be sentenced.
Oldfield, supported in court by a throng of well-wishers, smirked as Judge Anne Molyneux passed sentence.
But he looked surprised as the jail term was handed down.
The judge said Oldfield had acted dangerously, disproportionately, had not shown what he was actually protesting against, and displayed prejudice in sabotaging the event which Oldfield regarded as elitist.
Judge Molyneux said Oldfield ruined the race for everyone.
“You caused delay and disruption to it and to the members of the public who had gone to watch it and to enjoy the spectacle of top athletes competing,” she said.
“The rowers had trained for many months. You had no regard for the sacrifices they had made or for their rigorous training when you swam into their paths.”
Adding that Oldfield’s actions had endangered his life and those of others, the judge said: “You did nothing to address inequality by giving yourself the right to spoil the enjoyment of others.”
Oldfield would not be deterred from protesting again, his wife, Deepa Naik, said. Speaking outside court, the 35-year-old said: “Trenton has spent his adult life working on these issues and his direct action protest on April 7, 2012 was a natural extension of his everyday work.
“Trenton’s protest was a reaction to an increasingly brutal business, media and political elite.”