Early Buddhism
Buddhism is a nondual doctrine, in which subject, object, and action are all viewed as illusory.
As I understand it, Buddhism is not 'non dual' as such. And while unenlightened beings are subject to delusion, that's not the same as saying that 'subject, object and action' are all 'illusory'. But as I said, although I perceive error here, I don't as yet have the depth of study behind me with with which to confidently frame an alternative statement for Wiki.