AOG - how exactly would you prevent any group, be it the 'Far Left', or anyone else, from confronting a march in its neighbourhood?
If a march is convened, and a group of people gather to protest, they are, legally, a group of people in public who are not breaking any law. In order to prevent that situation from escalating into a riot situation, it would need the imposition of marhsall law - the powers of the police to prevent anyone from being in a designated area at a designated time.
How then would you prevent law-abiding citizens from going about their daily business?
It seems to me that preventing a protest in any meaningful way would cause far more problems than it solves.
The facility to protest against political marches is the same facility that allows the marches to take place - freedom of expression, of movement, and of speech, all of which are cornerstones of our free society.
To tamper with them would be a very dangerous move indeed.