Actually- this was sloppy reporting here which serves to muddy an already complex set of issues.
 The Sand Point Incident was not a tribal banishment- formal or informal.
 It was a community blue-ticket type affair:
" Parents and other concerned citizens were waiting for the man when a nightly PenAir flight arrived. The unarmed mob confronted him as he entered the terminal, then they proceeded to buy the man a one-way ticket back to Anchorage."
https://www.adn.com/crime-justice/article/reclaim-alaska-sand-point-aims-curb-rampant-drug-abuse/2014/03/27/