More accurately, the Taliban was supported by them.
Though that's not even really accurate either...the truth is that Afghanistan is better thought of as a geographical region than a country (they don't even recognize their own borders), and Afghanistan politics was, is, and will always be an unholy mess...particularly from 1980-2000, with the Pakis, Saudis, Russians, Iranians, US, and multiple corporate and special interest groups mucking around in it. To say any single entity supported any other single entity in Afghanistan is an egregious over-simplification; at its simplest, you might say that the Taliban and al Qaeda are two facets of the same issue.