Back in the day many of things we do today were considered taboos, (it highly depends were you are from). it ranged from operating on human bodies to not being able to touch or see high class people (in a caste system). Scientists did majority of their practices a secret since they could be punished with death sentences etc. A great example of this was in the UK (during medieval times). It was against the church to operate on a human body (it was taboo) but if scientist didn't start cutting people up to try to fix them or experiment on them modern day surgery wouldnt be existant. Majority of scientists strayed away from religion and superstition to find out the real reasons why people places and things do what they do.
The Declaration of Indian Purpose refers to the social movements, legislation, and beliefs by which tribes in the United States exercise self-governance and decision-making on issues that affect their people.