There was a video.
A public analysis of boots.  
Now two police agencies responsible for security at the Montebello Summit respond.

RCMP:

RCMP Cpl. Luc Bessette said the Mounties do “not use tactics that would encourage confrontation or incite violence.”

Bessette said the RCMP cannot discuss details of security measures for major events such as the summit because “to do so could jeopardize the integrity of our operations for future events.”

Surete du Quebec:

“I confirm (to) you that there is no agents provocateurs in the Surete du Quebec… It doesn’t exist in the Surete du Quebec,” spokesperson Const. Melanie Larouche told The Canadian Press.

People that were present on that street have told what occurred. Their accounts are  available in video interviews at CTV.

Stephen Harper who had said the protest were ‘disappointing and sad’ office has sent out a response from his office. 

A spokesman for Harper denied any role by the prime minister in the fair, saying “the PMO is not involved in security for events.” Public Safety Minister Stockwell Day’s office referred all questions to the RCMP.

Union leaders who brought the actions of the three disappeared men (no arrests according to a police spokesperson, no paper trail, no names)  in a public protest say they are continuing to compile evidence and do not know whether they will file an official complaint.

Retired police officer Doug Kirkland spoke to CTV news.

The trio could have been “rogues” or private security personnel, he said. “Honestly, I can’t imagine any police officer who’s in command putting three more mismatched people into that situation,”

Kirkland said. “You don’t take people who are well-fed, muscular, and that much older and think that they’re going to blend in. It’s stretching the bounds of credulity a bit.”

Another police officer left a similar comment at Dust My Broom. And he isn’t dismissing boot soles.

Watch the way the three ‘protesters’ stand. It is called the I stance or bracketing and is taught to police officers from day one as a way to minimise your bodies exposure to a threat. Agressive/squared off stances are what the riot officers are doing to intimidate.Defensive posturing is what the Provocateur’s are doing.They can’t help it. They are reading the crowd and smartly, trying to desingage.

Watch their left hands. They tend to stay close to their bodies center line. On most Sam brown belts that police wear, the OC spray, cuffs, etc are worn towards the center as well as for protection against threats.Their right hands stay further away, to their side to protect where their firearm would be if they were in their normal uniform that they wear 8-10 hours a day, everyday.(1/2 of all police deaths are from their own weapon. Retention is highly stressed in all forms of law enforcement training). They have muscle memory of where things ’should’ be when working.

Watch the ‘protestor’ on the right. When one of the real organisers gets too close, he grabs the organizer, deliberetly, by the wrist. This is an open handed control technique taught in the earliest days of academy training. It doesn’t get you caught up in the suspects grip while providing an easy way to index the placement of handcuffs.

All of these are taught and taught and taught some more so that they become second nature and one does not have to think about it in the heat of the moment. Having left law enforcement a decade ago, I till catch myself moving, standing and ‘looking’ at people the same way I was taught.

Going ‘plain’ cloths does not change the person wearing them.I don’t like bad cops since it made things difficult for us good ones.A good cop would have laid low and been a good witness instead of becoming the story.

Legal aid, at Montebello to assist arrested protesters - via: The Harper Index

The protest legal aid committee, however, received no report from authorities of their arrests, lending further credence to allegations the two were not genuine protestors. “Yes, these were definitely agent provocateurs, cops, and legal folks have no record of these supposed arrests,” said Peoples Global Action (PGA) spokesperson John Hollingsworth at the Indie Media Centre.

If everyone who has seen this video and read this story takes the RCMP and the Surete du Quebec statements at face value, must have questions police need to address.
Who are these three men? 
What happened to these three men?
Where are these three men?
Since hundreds from media outlets, blogs and protesters are asking, the police agencies responsible for protecting government leaders and the democratic rights of citizens have the mandate and the ability to investigate and give the Canadian public answers.
If people in Canada can be taken away by police on a public street in a public event and just disappear with no paper trail, no record, no explanation, this goes beyond left/right politics, dismissal, accusations and protester discrediting.
What is these three were not police, just citizens?

Disappeared man #1

Disappeared man #2

Disappeared man #3

If you know who these three lost people are, you can do what is democratic and responsible - contact the RCMP, the Surete du Quebec, The Council of Canadians and your MP.

Dr. Dawg has a  list of blogs and media still on this story.