courteaudotbiz writes "For years, a business named Compu-Finder has been sending spams all around the province of Quebec, Canada. In their emails, there is a phone number where we can reach them, and an unsubscribe link that you can click and seems to work, but even after asking them on the phone, by email or with their unsubscribe link, to unsubscribe me, I still receive 10 — 15 spams a week coming from this company. Many bloggers, journalists and radio chroniclers talked about them, but they seem to be untouchable. Still, it is easy to find the names, addresses and phone numbers of the shareholders and administrators of the company. How can we, collectively, take action to make them understand that we do not like their mass mailing practice?" Link to Original Source
We warn the reader in advance that the proof presented here depends on a
clever but highly unmotivated trick.
-- Howard Anton, "Elementary Linear Algebra"