Dennis Markuze (aka "David Mabus," etc.) is a notorious and prolific religious crank/serial cyberstalker from Montréal, Québec. He first became notorious for writing harassing letters to James Randi claiming that he'd somehow won the Million-dollar challenge, and has since taken up a life of stalking atheist bloggers such as PZ Myers (and anyone even remotely connected to them), including trying to spam links on this very page.
 Online threats
According to PZ Myers, Markuze began harassing him in 1993, starting with what Myers describes as "deranged messages" on Usenet and progressing to death threats over the years. PZ Myers claims to have notified the Montreal police of Markuze's death threats several times to no effect. Markuze has also been active for over a decade spamming hundreds of atheist related websites, Twitter pages, online forums, and email inboxes, including making hundreds of death threats to other atheists with online presences. His rants also regularly show up in Usenet archives dating back as early as 1993.
 Modus operandi
Markuze's modus operandi tends to involve persistently posting threatening, incoherent and weirdly formatted anti-atheist rants to any blog that strikes his fancy, rapidly morphing IDs (whenever possible including "mab" in the name) when he gets banned. His rants are often incoherent word salad (for example, "Atheist fuckers killed Mickey Mouse!"). His favorite targets include Richard Dawkins, Amanda Marcotte, Jen McCreight, Myers and Randi; he actually physically stalked Myers once at a conference in Canada, resulting in Myers reporting him to the police in September 2009. "Mabus" is apparently a reference to an Antichrist figure purportedly predicted by Nostradamus.
 Arrest, psychiatric evaluation and trial
After an August 2011 online petition attracted more than 5000 signatures, each resulting in an e-mail to the Montreal police, the police took action and announced they were finally investigating years of complaints (after pleading with people to stop sending them emails) and arrested Markuze on August 16. Markuze was charged with 16 counts of criminal harassment on August 15 and August 17, 2011. To the relief of many concerned for his well-being, the criminal court ordered him to undergo a 30 days psychological evaluation. After being diagnosed with bipolar disorder, compounded by alcohol and substance abuse, Markuze was sent to rehab while awaiting the next court date but later released. After pleading guilty to issuing threats, he received a suspended sentence of 18 months, which required him to abstain from internet discussions and forums.
 Arrested again
Less than two months later, Markuze violated those terms and began harassing people via Twitter, under the name Operation Archangel (@OperationArche, @Operati51436400 and variants). He was re-arrested in November 2012 and released after a court hearing on 19 November, after agreeing to a number of conditions. As of February 2013, he has violated those conditions first covertly and latterly overtly, sending threatening emails signed Mabus.
 Mabus returns
On August 13, 2013, Mabus resumed harassing PZ Myers. We await the next arrest.
- ↑ 1.0 1.1 Time to institutionalize Dennis Markuze
- ↑ Markuze's attempts to change this page
- ↑ 3.0 3.1 3.2 Case Study: How a notorious spammer was brought down via Twitter
- ↑ Pharyngula - Dennis Markuze Exposed
- ↑ Pharyngula - Update on Dennis Markuze
- ↑ VICTORY! Montreal Police Begin Formal Investigation of “David Mabus”
- ↑ Montreal police investigating alleged threats made against atheists
- ↑ 
- ↑ Montreal police deluged by thousands of Internet complaints about local man
- ↑ Montreal police make arrest in "Mabus" case on online death threats
- ↑ Montreal's 'Mabus' faces 16 charges for online threats
- ↑ Two tweets by Stephane C Giroux
- ↑ Mabus/Markuze Out and Back in Business
- ↑ 
- ↑ http://freethoughtblogs.com/axp/2012/07/26/is-dennis-markuze-already-violating-the-terms-of-his-suspended-sentence/
- ↑ http://skeptools.wordpress.com/2012/11/20/operation-archangel-david-mabus-dennis-markuze-montreal-arrested/
- ↑ https://twitter.com/spvm/status/270625482049998849
- ↑ http://doubtfulnews.com/2012/11/dennis-markuze-aka-david-mabus-arrested-again/
- ↑ Comment on Pharyngula