Nine far right rallies planned for the weekend have been cancelled after organisers feared they could descend into violence a week on from the Charlottesville bloodshed.

Jack Posobiec, a self-described "new right conservative" who helped propagate the "Pizzagate" conspiracy theory, organised the March on Google to protest the decision by the tech giant to fire an employee last month over an anti-diversity memo he wrote.

The march had been planned to take place in nine different cities across the US but organisers said they had been forced to postpone it due to "alt-left terrorist threats".

"The Peaceful March on Google has been postponed due to credible Alt Left terrorist threats for the safety of our citizen participants," they wrote.

"Despite our clear and straightfoward statements denouncing bigotry and hatred, CNN and other mainstream media made malicious and false statements that our peaceful march was being organized by Nazi sympathizers.

"Following the articles, credible threats from known Alt Left terrorist groups have been reported to and relevant authorities have been notified."

Usage of the term alt-left has become more widespread among the far right community in the wake of the Virginia protests but many have criticised it as having little meaning.

News agency Associated Press said they would no longer be using the term “alt-right” in the wake of the protests "because it is meant as a euphemism to disguise racist aims."

Violence on the streets of Charlottesville Show all 9 1 /9 Violence on the streets of Charlottesville Violence on the streets of Charlottesville Protesters clash and several are injured White nationalist demonstrators clash with counter demonstrators at the entrance to Lee Park in Charlottesville, Virginia. A state of emergency is declared, August 12 2017 Violence on the streets of Charlottesville Trump supporters at the protest A white nationalist demonstrator walks into Lee Park in Charlottesville, Va., Saturday, Aug. 12, 2017. Hundreds of people chanted, threw punches, hurled water bottles and unleashed chemical sprays on each other Saturday after violence erupted at a white nationalist rally in Virginia. AP Photo Violence on the streets of Charlottesville State police stand ready in riot gear Virginia State Police cordon off an area around the site where a car ran into a group of protesters after a white nationalist rally in Charlottesville, Virginia AP Photo Violence on the streets of Charlottesville Militia armed with assault rifles White nationalists, neo-Nazis and members of the 'alt-right' with body armor and combat weapons evacuate comrades who were pepper sprayed after the 'Unite the Right' rally was declared a unlawful gathering by Virginia State Police. Militia members marched through the city earlier in the day, armed with assault rifles. Getty Images Violence on the streets of Charlottesville Statue of Confederate General Robert E Lee The statue of Confederate General Robert E. Lee stands behind a crowd of hundreds of white nationalists, neo-Nazis and members of the 'alt-right' during the 'Unite the Right' rally 12 August 2017 in Charlottesville, Virginia. They are protesting the removal of the statue from Emancipation Park in the city. Getty Images Violence on the streets of Charlottesville Racial tensions sparked the violence White nationalists, neo-Nazis and members of the 'alt-right' exchange insults with counter-protesters as they attempt to guard the entrance to Lee Park during the 'Unite the Right' rally Getty Violence on the streets of Charlottesville A car plows through protesters A vehicle drives into a group of protesters demonstrating against a white nationalist rally in Charlottesville, Virginia. The incident resulted in multiple injuries, some life-threatening, and one death. AP Photo Violence on the streets of Charlottesville Rescue personnel help injured people after a car ran into a large group of protesters after an white nationalist rally in Charlottesville, Virginia AP Photo Violence on the streets of Charlottesville President Donald Trump speaks about the ongoing situation in Charlottesville, Virginia from his golf club in Bedminster, New Jersey. He spoke about "loyalty" and "healing wounds" left by decades of racism.

The event had originally been billed as an opportunity to protest Google's "monopoly" on power. Organisers claimed the company was trying to silence "dissenting voices" by censoring YouTube content but denied it was an "alt-right" march.

“Google is a monopoly, and its [sic] abusing its power to silence dissent and manipulate election results,” organisers wrote on the rally's page. “Their company YouTube is censoring and silencing dissenting voices by creating ‘ghettos’ for videos questioning the dominant narrative. We will thus be Marching on Google!”

But the wave of marches had sparked widespread concern after three people were killed in violent protests in Virginia last weekend.

Heather Heyer, 32, and two state troopers died after white supremacist groups and counter-protesters clashed in the city.