An anti-vaccination protester accused the former health secretary Matt Hancock of killing people during the Covid pandemic, and Hancock claimed he had never felt more intimidated.
The MP was allegedly shoved by Geza Tarjanyi, 62, who was also shouting "ridiculous conspiracy theories.".
He has denied harassing people without resorting to force.
Mr. Hancock testified as a witness that the protester made him afraid of being pushed down an escalator.
He testified before Westminster Magistrates Court that he couldn't remember a time as a public figure when he felt this intimidated.
On January 19, Mr. Hancock and a member of his staff passed a demonstration against vaccinations close to Parliament, where Mr. Tarjanyi captured the pair on camera.
In the course of the five-minute exchange, Mr. Tarjanyi allegedly shoved the MP for West Suffolk and questioned why he had "killed so many people.".
The former minister claimed that Mr. Tarjanyi had "physically intimidated" him and called him "completely unreasonable.".
He continued, "It made me feel uneasy moving about my workplace, and it made me angry that someone was trying to intimidate me rather than having a civil conversation. I thought that was unacceptable.
"I had a pretty good feeling that he had been brainwashed by these absurd conspiracy theories. ".
Mr. Hancock claimed that he chose not to report the incident on January 19 in part because he did not want "these people with these false beliefs to get further publicity from harassing me.".
On January 24, a few days later, Mr. Tarjanyi followed Mr. Hancock through Westminster Underground Station and onto a train for roughly ten minutes after they had breakfast together the day before.
He once more charged the MP with killing people.
Since the defendant was alone, Mr. Hancock claimed he recognized him and felt "more intimidated" as a result. He then attempted to get help from Transport for London (TfL) staff.
But Mr. Tarjanyi allegedly started intimidating "anybody who was going to come to my aid," as he testified in court.
The 44-year-old claimed that while stopping at the escalator's top to "resolve the situation," he felt the defendant pushing him in that direction.
"It's obvious that at this point, I was very anxious. I would have fallen down the escalator at that point if I had lost my balance, he said.
I had to work to keep my balance and prevent falling down the escalator because I was being pushed from behind, Mr. Hancock claimed. ".
The two men then boarded a Jubilee Line train, where Mr. Tarjanyi allegedly accused the former health secretary of "murdering millions of people," the court was informed. They were later separated at Bond Street station.
As seen in video of the second incident taken from the defendant's phone, Mr. Hancock was referred to as a "murderous scumbag" and the lockdown amounted to harassment of the nation because of his "lies and deceit.".
Defense attorney Parveen Mansoor stated that Mr. Tarjanyi claims Mr. Hancock "barged into him" and has denied any physical contact.
Nutan Fatania, the prosecutor, claimed that Mr. Hancock was "left shaken up by both incidents" and worried about his own safety.
When he frequently spoke on behalf of the government as the health secretary under the then-prime minister, Boris Johnson, during the Covid pandemic, Mr. Hancock became well-known.
After pictures of him kissing Gina Coladangelo, one of his advisers who has since become his partner, were published the following year, he was forced to resign.
He is still under suspension as a Tory MP for skipping out on work to appear on I'm A Celebrity. In November 2022, Get Me Out Of Here! will air.
