What was the story behind the colony that was posioned via koolaid laced with posions?

it is the Jonestown massacre.

You're thinking of the Jonestown massacre, it was a cult led by Jim Jones, search for it on Wikipedia.

Those poor misguided souls were being led by an insane man who thought he was being talked to by God. Jim Jones was a real nut case.

Jones town. A collection of religious misfits who committed mass suicide by voluntarily drinking poison. It was just a cleansing of the gene pool.