Sometimes I get lost in public discussions these days. Everyone is “fascist”, “far-right”, and “leftist” at the same time.
There are some hilarious misconceptions that members of those factions have about their own ideologies. Far-left is against the police brutality, but there is a 100 year history of perfect correlation between leftist regimes and policy brutality.
Far-right is against government interventions in all economic matters, but that also has never materialized anywhere else.
The bottom line is that anything that's far-something requires suppression of the society's natural tendency to return to the center.
They were certainly leftist. Many would consider them far leftist today. (Of course they weren't, but that doesn't mean the label wouldn't be applied.)
Neither was legendary for police brutality. That came later, with Thatcher's response to the Miner's Strike and the poll tax riots - among others.
It is also likely that subjects of certain British colonies would have a substantially different opinion on police violence.