Bruce Olson is a Scandinavian-American Christian missionary best known for his work in bringing Christianity to the Motilone Indians of Colombia and Venezuela. Olson's 2006 autobiographical book Bruchko has sold more than 300,000 copies worldwide and is translated into several languages. One journalist has asserted that the book is a touchstone of missionary literature. Olson was granted Colombian citizenship in 1988.

Swedish anthropologists accused Olson of destroying an aboriginal tribe and called for him and other Christian missionaries and linguists to be expelled. This scrutiny compelled Swedish journalist Andres Küng to travel all the way to the Colombian jungle to investigate and interview Olson personally. Küng's findings were quickly published in support of Olson.

John Allen Chau, who identified Olson as a major source of inspiration, was killed by the isolated Sentinelese tribe while attempting to convert them to Christianity in 2018.

Shortly after arriving in Venezuela, Olson heard about the Motilone, a tribe living on the borders of Venezuela and Colombia that had been in the news because of violent clashes with oil company employees seeking to drill on their land.

Olson received international attention when he was kidnapped by the National Liberation Army (ELN) on 24 October 1988. The ELN judged him in the revolutionary justice system, and found him guilty of exploiting the Motilones. He was sentenced to death, and his execution was planned. On July 6, 1989, the ELN told the media:

“Mr. Bruce Olson has deliberately and irresponsibly incurred very serious crimes in developing an exploitative activity and colonizing, decimating a third of the population during the years from 1963 to 1970. For the veracity of the charges made, we consider him guilty of a crime against humanity in the Colombian Motilone groups, and consequently we condemn him to the penalty of death.”

Journalist Maria Cristina Caballero published a series of articles in which she personally investigated Olson's thirty-year-stay with the Motilone and also interviewed many indigenous leaders. Olson was released after ten months in captivity, largely due to the attention prompted by Caballero's articles*. The president of Colombia later said of Olson, “This is the first white man to be defended by the indigenous communities in our country, in Latin America.”

*This is the Swedish press-release by Libris (publisher) Bokførlaget Libris Ørebro, Sweden.
They mention Maria Cristina Caballero who wrote a series of articles in El Espectador on the hero YADO, to later discover this is Bruce Olson. Because of these published series, she was forced to abandon Colombia or be executed by "narco-guerilla".