Everyone participates in this, some more than others, some knowingly and most people, unknowingly. I remember when I was a kid, there was a movement to boycott crackers (during diwali time) in India, as kids were employed by the industry. Lots of people, including me, stopped buying crackers. It did have some effect, but I doubt how much.

Ultimately, it is left to the each individual I guess. If only each one of us decide not to buy products of slave labor, not to support war etc, world would be a better place in an instant.