This is certainly not specific to Nuage or cults. Some useful resources.
America's Worst Charities
http://www.tampabay.com/topics/specials/worst-charities.page
Ranked by how little money gets to their supposed causes.
http://www.tampabay.com/americas-worst-charities/
Charities cited by state and federal investigators, w/ a search function.
http://charitysearch.apps.cironline.org/
And a place to report a suspected abuser for investigation.
http://www.tampabay.com/topics/specials/worst-charities-submit.page