Read what PZ Myers has to put up with every day: Time to institutionalize Dennis Markuze. This is not right. It's an embarrassment that Canada can't deal with this problem.
For several years Dennis Markuze has harassed and threatened scientists, writers, public figures, atheists, and their friends under the pseudonym "David Mabus". While this was previously a minor annoyance, the intensity and frequency of his communications have increased.
"Mabus" attacks now include hundreds of Twitter accounts (used and discarded as they are reported). He has threatened young boys and girls as well as adults (including Rys Morgan, 16, who was acknowledged by some in the science community for exposing a dangerous quack medical treatment). In fact, anyone who associates with scientifically and skeptically minded people like PZ Myers, Phil Plait, James Randi, Brian Dunning or Michael Shermer is likely to become a target for unsettling rants and threats to their life and well-being.
Markuze has even gone so far as to attend meetings of such people, including attending the American Atheist Convention in October 2010, held Montreal.
It is time for the police to take his threats seriously. The problem must be addressed before it escalates beyond Internet bullying and veiled threats to become something worse.