A citizen's arrest is an arrest made by a person who is not a sworn law enforcement official. In common law jurisdictions, the practice dates back to medieval England and the English common law, when sheriffs encouraged ordinary citizens to help apprehend law breakers.
Despite the title, the arresting person does not usually have to be a citizen of the country where he is acting, as they are usually designated as any person with arrest powers. Source: Wikipedia
Stuart Littlewood argues that citizen-delivered justice can go a lot further:
Genocidal tyrants, corrupt leaders and bloodthirsty heads of state hankering for global domination and wishing to keep the world in turmoil once again infest the planet. They are often born and nurtured in the Western democracies the world is told to admire but which are now so corrupt they disgust many right-thinking people. These menaces can’t be brought to justice in the normal way, so it’s a job for a revived and revamped Assassination Bureau.
Military commanders in the resistance and bomb-making freedom fighters are not the issue. The people of the world need an instrument to eradicate the low life in high places that threatens humanity. They need to dispatch those who deal in mega-deaths, who meddle massively where they have no business, who create injustice and who make life miserable for millions. We all have our wish list. I’ll wager the same target names keep reappearing.
Think of it: a socially-responsible international public riddance service ready to do business with any member of the public who feels himself at war with these evil forces and can put a good case for a slaying before the bureau chief and his panel. I see long queues forming to enlist the bureau’s help in eliminating the world’s tormentors. For them there is no hiding place. Riddance requests have to be accompanied by a suitable “intelligence finding”, of course.
The work of an Assassination Bureau would be perfectly “legal” and “legitimate”, and most certainly “necessary”. It would simply follow the precedent set by America and Israel. SOURCE
No long ago I toyed with the very same idea for a thriller novel. Yet again life proves much more interesting than fiction. The movement to take charge of our own wellbeing is growing. We can no longer leave it up to those who claim to speak and act on our behalf but time and again prove to be the very enemy they vow to defend us from.