Here's a summary from nypost.com:
Osama bin Laden tried to buy a massive amount of cocaine, spike it with poison and sell it in the United States, hoping to kill thousands of Americans one year after the 9/11 attacks, The Post has learned.
Sources said the feds were told that bin Laden personally met with leaders of a Colombian drug cartel.
The drug lords turned him down, as it would be bad for business in the long term. But it would probably wipe out more of Manhattan than any random subway bomb. I would have, maybe two friends left alive. And they're not much fun anyway.