Why do cult-like groups try to prevent new members from communicating with family and friends outside the group?

Question

Quizplus · Accepted Answer

By preventing new members from communicating with friends and family outside the group, the cult-like group can create a bubble in which their beliefs and practices are reinforced by group members who have no dissenting opinions. Allowing contact with outsiders increases the possibility of dissent, and the presence of even one dissenter can make it easier for other individuals to resist social influence pressures. This can weaken the hold that the cult-like group has over its members, and make them more likely to leave.

Why Do Cult-Like Groups Try to Prevent New Members from Communicating