Being somewhat new here, I don't know if this has already been discussed. I've heard the names mentioned before (Swan orientation video) of whom it was that founded/started Dharma, but how did they find out about the island? I mean, the island is hard to find, right?
I started really thinking about this today, after reading some other posts here. If the hostiles were able to fight off the U.S. Army from infiltrating their island, why wouldn't they have been able to do the same when the Dharma first arrived? I also read here that Widmore's name (was it Widmore Industries?) was written on the side of one of the pallet drops? And why else would the Dharma group errect building/houses over key island locations (Ben's barracks over Cerebus' summoning location, or the Orchid being built that close to the Donkey Wheel)?
Was the island's whereabouts leaked by an other/hostile? Perhaps they wanted to entrust a select few outsiders to purge the island's natural resources for a financial gain?