Pro-Brexit activist James Goddard has admitted harassing the ex-Tory MP Anna Soubry.
Thirty-year-old Goddard filmed himself shouting abuse at the remain-suporting politician, claiming she was a "traitor" for refusing to accept the outcome of the 2016 EU referendum.
He also branded her a "Nazi" and "scum" as she took part in a TV interview outside Parliament.
She was then surrounded by Goddard and others as she made her way into the Palace of Westminster, video footage played in court showed.
In her victim impact statement made following the incident, small sections of which were read in court, Ms Soubry said: "I was really intimidated, and I was very shaken by what happened, however I couldn't show it on camera.
"I have developed a mechanism for cutting off large parts of my emotions."
At Westminster Magistrates Court today, Goddard admitted one charge of intent to cause Ms Soubry harassment, alarm or distress, using threatening, abusive or insulting words or behaviour, or disorderly behaviour.
He also admitted one racially aggravated public order offence towards a police officer.
He and fellow defendant Brian Phillips, have been released on bail ahead of sentencing on Monday afternoon.
In a statement following the case, Ms Soubry said she was "pleased" with the Goddard pleading guilty.
"In a democracy, people have a right to peaceful lawful protest. No-one has the right to intimidate and abuse anyone. I am particularly pleased justice has been done in relation to the police officer," she said.