Siding with Crater

Siding with Crater is a main quest in the Fallout 76 Wastelanders update.

Walkthrough
Talk with Meg to confirm the choice to side with Crater for the heist on Vault 79. This immediately completes the quest. Before making their decision, a message box will appear to warn the player, that their decision is final, giving them time to reconsider or back out for the time being before making up their mind.

Agreeing to work with the Raiders in this quest leads to the From Russia With Lev quest. Note that any active quests from the Settlers quest line are automatically failed and access to potential follow-up quests is void. These include Trade Secrets, Invisible Ties, Duty Calls, Siding with Foundation, Division of Wealth and All That Glitters.