The three main historic parties of Parliament each have their secrets, of course, but modern research is providing a more open look at their respective predicament.
The big picture is that they all have a darker side. Their activity is not always informed by it, but their status may be. It can affect election outcomes in some places.
According to research, the Conservatives favour contact books; Labour have sought to use protest; and the Liberal Democrats have had their own hired hands.
These aren’t isolated incidents but are a regular feature in their party activity. It’s also believed membership routes are used to pass criminals into activity.
The result is fear and intimidation on UK streets. Election times are uncertain because in some constituencies the candidate choices may confuse local branches.