Don't think the smuggling actually went through Mena. (been there many times) It did happen in AR. I have never been convinced it happened from the top.
Ollie? (no way he was in on it) Felix Rodriquez? (doubt it) Barry Seal? (probably, he was killed in LA before he could talk about it) Other players? sure.
The Clinton Chronicles, by Patrick Matrisciana, has details about covert operations at the airport at Mena, Arkansas. VP Bush had to get Gov. Clinton’s permission to fly into and out of that small airport. Drugs were distributed from there, with Clinton getting a cut.
A lot of people involved in that operation, people in the know, were later murdered.
Note: at this moment there are five copies of The Clinton Chronicles for sale on Ebay. (None of them are mine.)
Here’s a “golden oldie” you might want to take a look at.
http://www.freerepublic.com/focus/f-news/1945653/posts