We all know that, in today's world, telling the truth may set you free, but it can also make you an inmate or a corpse. Activist folk singer Joan Baez, however, reminds us that, "Courage has to do with being afraid and doing what you have to do anyway." It is a fitting description of whistleblower Edward Snowden, whose story is told by the Oscar-nominated American filmmaker Laura Poitras (My Country, My Country) in her intimate and intense documentary Citizenfour. Snowden, a 29-year-old former NSA contractor and intelligence analyst, aware of the serious personal and legal consequences, nevertheless exposed the fact that the government, in the name of fighting terrorism, was spying on all American citizens and those of other countries, in every area of their lives, whether they were suspected of wrongdoing or not.

According to Snowden, he was able to access anyone's records, bypassing codes, passwords and encryptions and said, "We are building the biggest weapon for oppression in the history of mankind." As the film begins, Poitras tells us in voice-over that, when she was working on a film about the dismantling of personal freedoms after the terrorist attack on 9/11, she began to receive encrypted e-mails with the codename of Citizenfour, revealing the desire to come forward with startling information about government surveillance.

One of the e-mails told her that "In the end, if you publish the source material, I will likely be immediately implicated. I ask only that you ensure that this information makes it home to the American public." The film almost exclusively relies on edited conversations, mainly between Snowden and author and journalist Glenn Greenwald interspersed with TV news reports, courtroom trials, and Senate hearings where officials are shown lying at hearings about the government's role in data collection. It does not pretend to be objective and there is no debate about any of the issues brought up in the film or the efficacy of Snowden's actions. It is his story, told from his point of view.

Interviewed by Poitras (who is unseen), Greenwald, at the time working for the Guardian, and reporter Ewen MacAskill in a room at the Mira Hotel in Hong Kong where Snowden remained in seclusion for eight days, the heretofore unknown whistleblower reveals his identity for the first time saying that he wants to come out publicly as the source of the information, to show the NSA "I'm not going to let you bully me into silence, like you have everyone else." Snowden says that he made the decision to come forward because he feels there's a great threat to the future of American free speech. "The elected and the electorate," he says, have become "the ruler and the ruled."

Though he says repeatedly that he is not the issue and his personality should not deflect attention from the material disclosed, the human angle nonetheless becomes an important part of the film and we have an opportunity to assess the personality and character of man who has already played an important role in history. Through all of the discussion of his methods and the nature of the material he revealed, Snowden presents his case in an eloquent manner, remaining calm and centered, saying that he anticipated the consequences and is prepared for them.

One of the few times he shows emotion is when talking about the government's interrogation of his girlfriend who, he says, knows nothing about his activities. The tension is palpable, however, and the film takes on aspects of a spy thriller when, after the information has gone public, everyone in the hotel room reacts with paranoia to the fire alarm testing going on in the hotel. Communication, however, eventually reverts to coded e-mails which Poitras shows on the screen when Snowden seeks asylum in Moscow. Though it reveals no new information that hasn't already been reported all over the world during the past eighteen months, Citizenfour is fascinating to observe as history unfolds before our eyes, offering the look and feel of immediacy, not that of a historical retrospective.

While it has taken several years, the warning message in Al Gore's 2006 film An Inconvenient Truth on the potentially disastrous results of climate change seems at long last to be getting through, though even now, it may be too little, too late. When it comes to our right to privacy in today's wired world, however, the prospects are not as bright. Though perhaps preaching to the choir, the film is an important reminder that in the words of the Rev. Martin Luther King, Jr., "Our lives begin to end the day we become silent about things that matter," or those of abolitionist leader Frederick Douglass who said, "Power concedes nothing without a demand. It never did and it never will." This film begins to crystallize that demand.

Greetings again from the darkness. Edward Snowden. You know the name and you know the story. Hero of the People or Enemy of the State? Ultimate Patriot or a double-spy for the Russians? Protected as a Whistle-Blower or Guilty of Treason? Chances are you long ago made up your mind on how you view Ed (his stated name preference).

In January 2013, Snowden contacted documentarian Laura Poitras via an anonymous email name "Citizenfour". By June, the two were meeting in a Hong Kong hotel along with journalist Glenn Greenwald. What follows is a mesmerizing look at the actual footage shot of Greenwald interviewing Snowden. This is Ed Snowden before the media storm. This is Ed Snowden continually proclaiming that he is not the story, and he is trusting Greenwald to determine what documents are fit for public release. He voices concern about jeopardizing national security, while at the same time being adamant about exposing the immense and widespread governmental tracking of digital movements by millions of people … most with no known ties to terrorism.

The timeline is public record, so the core of the film is really an intimate look at the man who, acutely aware of the coming fallout, proceeded with pulling the curtain back on NSA actions that he deemed inappropriate. Ms. Poitras structures the film as a thriller, and it will certainly cause tension in every viewer. We can't help but put ourselves in Snowden's shoes. Would we feel the need to go public with proof? Who would we tell? How would we tell them? Would we be willing to release our name, knowing it could put everyone we love in danger? Would we be prepared to watch our President publicly call us out as unpatriotic and a danger to the nation? These questions are impossible for us to answer, but add weight to the scenes of Snowden answering Greenwald's questions while Ms. Poitras works the camera.

One of the more interesting points made in the movie is that what we once termed individual freedom and liberties, is now couched as privacy. We have come to expect our privacy, and certainly don't appreciate our government digging through our emails, search history, texts and phone calls. But how to balance the individual "right" to privacy with the government's need to collect intelligence in the name of national security? That's the key question, and one with no clear answer.

Regardless of your opinion on Snowden and his actions, the film presents him as an idealist believing he is doing the right thing. Most of this occurs before the media firestorm, but we do see the anticipated fallout. Once Snowden goes into hiding, we witness Greenwald becoming the face and voice of the cause. He is a talented journalist and exceptional speaker, and doesn't back down from the reaction of those who stand accused.

The film allows us to take notice of the personal attacks on Snowden as an attempt discredit his documentation. Making Snowden the story distracted the media and the general public from the real issue. It's a fascinating film that will surely make you uncomfortable and cause re-evaluation of the chain of events. You may not change your mind, but you will most certainly have a better understanding of the human side.

CITIZENFOUR is the documentary that was being shot when US whistleblower Edward Snowden decided to go public with his story of America's NSA spying on its own citizens as well as the rest of the world. It's a vivid, paranoid tale told in a thoroughly compelling way, no matter what you think of the protagonist and his motives.

The documentary kicks off by explaining the background to the situation to its viewers before holing up with Snowden in a Hong Kong hotel, where things begin to play out in real time. And from this point in it becomes unmissable, a story of paranoia and spying in a digital age. It's frightening how much this has in common with the likes of the supposedly fictional Bourne movies.

There's an element of tragedy here, a la THE INTERNET'S OWN BOY, which told how Aaron Swartz was persecuted in a similar (but even less deserving) way, but in the end I found this to be a story of hope: how a team of dedicated journalists can outwit even one of the most powerful agencies in the world.