A rather interesting Op-Ed article in the Latin American Herald Tribune is asking the appropriate question and shedding some light:

In Honduras, the Constitution orders that election laws may not be amended or submitted to referendum less than six months before elections to public office. In Honduras, general elections are slated for November 29 this year.

Despite this constitutional precept, the then-President of the Republic of Honduras, Manuel Zelaya, considered that he was not bound to comply with this rule and called a referendum to decide whether, at the November general elections, a constituent assembly would also be called that would permit him to run for reelection. Who violated the Constitution?
This next paragraph I found to be of particular interest in light of the aforementioned OAS Charter's Article 19, prohibiting other member states' direct or indirect intervention.

So, he ordered the chief of the General Staff of the Armed Forces, Romeo Vásquez Velásquez, to transfer and safeguard the electoral materials that the Venezuelan Government had prepared and donated. General Vásquez Velásquez refused to follow this illegal order, and, as a consequence, was dismissed. Who violated the Constitution?
But wait! There's more...

But Zelaya carried on with his preparations and only performed a cosmetic change to this illegal referendum: on Saturday night, he verbally stated that the referendum would not be binding, but confirmed that it would go ahead as planned. Who violated the Constitution?
You also get the Ginsu Knives!

It is more than likely that the OAS will, once again, succumb to the demagogic temptation to defend certain fledgling dictators disguised as democrats.
Interesting too is the author(s)' parting shot.