What do you think it takes to get on the police's criminal investigation database? The sensible answer would be that it would contain reports of crimes - burglaries, murders, stolen cars, that sort of thing. Instead, it is being used to track day-to-day union business: pickets, meetings, public campaigns.
This is outrageous. Quite apart from the fact that it is a complete waste of resources, it is treating peaceful groups like criminals. And that should be utterly unacceptable in a democracy.