If, within the ranks of the mainstream community, there are corrupt and oppressive people, you will still find among them righteous ones who can aid you against those wrongdoers. However, if the whole group itself turns rebellious, then withdraw from them and go elsewhere. The Most High says: “Was not Allah’s earth spacious enough for you to emigrate therein?” (Qur’an 4:97). He also says: “Indeed, My earth is vast, so worship Me alone.” (Qur’an 29:56).