She seems so nice, but she told me recently about being apart of a gang in Morocco. Not a group of friends, a legitimate gang, with ranks, and violence, and crime.

They play card games where people who lose have to be hit (number of times depending on cards) or take dares (number of times depending on cards).
They dared an eight year old to walk into traffic. According to my friend, they forced him to while he didn't want to and was resisting, and she has no problem with it at all.
I asked her the age of the youngest person who plays the card game. It's four.
She said that they don't actually harm him though, because his eleven year old brother is the leader of the younger sect of the gang, and he's dangerous, or something. But she said that if that person wasn't his brother that they (and she) would've harmed him.
I tried to explain why people who are four can't give consent and understand the magnitude of the situation, but she said that it's different with four year olds in Morocco, because of the culture, and that they really do understand and are much more mature. >.<
And she threw a knife at a little kid.
Apparently she met them because of one night around two in the morning when she couldn't fall asleep, and decided to go out and play soccer. Some guy from the gang was biking really quickly towards her, and she was worried he was going to do something, so she asked him if he wanted to play soccer. So they did, and he started asking her for personal information (like her real name and Facebook account). She gave him a fake account, but later found out that he lives on the same block as her aunt or something, and she ended up giving her real account somehow.
There are people there who want to marry her, and she feels threatened with violence if she says no. I'm trying to convince her to GTFO of the gang, but she won't listen.
"It's normal there."
"You don't understand, the gang is family."
"Bonds form really quickly."
"I almost considered running away and staying with the gang. It would be really easy."
"You might think that we treat the kids bad, but you should hear what their parents do to them."
She said that she likes being in the gang more than how she is in America.
I could go on, but I think that it's pretty clear that if she's telling the truth that she's vicious. I'm just not sure what to do about it. She said that her parents don't know... Hm... I might have a moral obligation to tell them. What do you guys think? I'd hate to do that, but I haven't been able to convince her to get out of the gang.
She's been showing me the gang members Facebook accounts, so I could contact them.
Also, I should note that she has a bit of a history of cheating/lying.
I'm starting to wonder why I'm friends with her.
I didn't know about this stuff until very recently, and she seemed so nice. And she is pretty nice to me, but... she's horrible in Morocco. She said that if I saw how she was in the gang that I'd want a restraining order...
Also note that, according to her, she's spent one month with them and met them the last time she was in Morocco (the summer).