Luke, if you're serious and if you're asking if you could be in danger, others here have given you the hallmarks to watch for. If you are given the message, implicit or explicit, that non-members (even family and friends) are "outsiders" and all contact with them should be stopped; if they ask or demand that you give up money, material possessions, etc., to them; if illegal activity is taking place (for example, sexual contact with children, drug abuse, etc.)--or if you just feel in your gut that something's wrong, trust your instincts and get out of there.