The canonization of the missionary Junípero Serra by Pope Francis this week has once again brought the discussion about the connection between mission and colonialism into the world public. Already in advance there was a lot of protest from Native American organizations and activists. The American Indian Movement (AIM) in California held a tribunal for Serra in Los Angeles in which he was convicted of enslavement, torture, and participation in genocide, among other crimes. The Walk of Anchestors proclaimed a Day of Mourning on the day of canonization after a 650-mile pilgrimage in memory of the victims of missionization. An initiative around Norma Flores tried to prevent the canonization by petition. An interview with Flores can be found here.
For those interested in the connection between mission and colonialism, the film The Colonial Misunderstanding by Jean-Marie Teno is recommended.
Addendum: And here is the reference to a detailed background article by Indiancountrytodaymedianetwork.