F&F has come out in drip and drabs, and so there are thousands of incremental articles which don't show the forest. There have been very few GOOD noob summaries written...perhaps Mesta has a best of.
Let me try?
Mexican drug cartels hire "Straw Purchasers" to buy guns from licensed dealers in the US.
ATF/FBI had in the past allowed these people to buy, and then immediately nabbed them in a sting--never letting the guns out of their control.
In Gunwalker somebody (up high or down low?) had the bright idea to turn their heads and let the guns keep "walking" to their final destination, where the serial numbers would be verified...but obviously only once they were recovered at crime scenes.
Brian Terry's murder, a federal agent, was one of those crime scenes.
Coincidentally, about the spring of 2009, Hillary Clinton and the rest of the Administration was spreading a myth that 90% of the guns used in mexican drug crime were from legal dealers in the USA....thus providing support for efforts to pass more gun control legislation.
After Congressmen Issa and Senator Grassley started turning stones, they found some whistleblower agents and firearm dealers willing to talk. Then other programs were found outside of Arizona....now the administration is running for the hills claiming they had no idea about any of this, after a failed attempt to blame Bush.
You do the math. Pigs/Mesta, correct me if I'm wrong.
As this story has progressed, it has become more and more convoluted and far more expansive than most people would think possible. It has encompassed virtually every law emforcement and intel agency, along with the whitehouse and state department. It has been operating in different countries using different op names from different locations within the US. It is HUGE.
The more people that can condense this convoluted mess, so that more people understand the seriousness of this crime, the better. I hope lots of these little synopses make others curious as to looking for more info, writing Issa with a letter of encouragement, etc.