Members of the nation’s newly empowered far right — from grass-roots organizers to federal lawmakers — say their movement would not have risen so far, so fast, without YouTube’s recommendation engine.

New research has found they may be correct. YouTube’s search and recommendation system appears to have systematically diverted users to far-right and conspiracy channels in Brazil.

A New York Times investigation in Brazil found that, time and again, videos promoted by the site have upended central elements of daily life.

Teachers describe classrooms made unruly by students who quote from YouTube conspiracy videos or who, encouraged by right-wing YouTube stars, secretly record their instructors.

Some parents look to “Dr. YouTube” for health advice but get dangerous misinformation instead, hampering the nation’s efforts to fight diseases like Zika. Viral videos have incited death threats against public health advocates.