Can you solve this Puzzle?

It's time for us to try solving the logic problem. You can take a look at the illustration below to help you solve the problem.

Here is the scenario:

 Four criminals are caught and are to be punished. The judge allows them to be freed if they can solve the puzzle. If they do not, they will be hung. They agreed. The four criminals lined up on some steps(shown in picture). They are all facing in the same direction. The wall separates the fourth man from the other three.  

To Summarize:

-Man 1 can see men 2 and 3.

-Man 2 can see man 3.

-Man 3 can see none of the others.

-Man 4 can see none of the others.  

The criminals are wearing hats. They are told that there are two white hats and two black hats. The men initially don't know what color hat they are wearing as soon as they for certain what color it is.   -They are not allowed to turn around and move. -They are not allowed to talk to each other -They are not allowed to take their hats off.  

Now the question is "Who is the first person to shout out and why?"      

Comment your answers below. :)  

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