Once an underboss's loyalty drops low enough they will turn on Lincoln, triggering the betrayal mission. Many factors play a role in loyalty, including assigning or taking away rackets, assigning districts, and doing agenda or trafficking missions.
Some underbosses are also more susceptible to betrayal than others, so there is no set method for getting one to turn. Simply never giving them rackets may not trigger betrayal with all underbosses. The best way to ensure betrayal from any underboss is to do the following:
- Do not complete any trafficking or agenda missions for that underboss.
- Once the home territories are done, begin assigning them rackets and then take them away at the sitdown. This may need to be done on two or more occasions.