What would you do in my situation?

Sorry this is so long and sorry for my rambling but I really need your opinion.

I have 4 now adult children, 2 with my first husband, 2 with my second husband, my first husband has died and I am divorced from my second, my first 3 children are all doing fine and I am not worried about them.

My second husband though may be a problem though, he remarried a women and moved to her hometown which was a horrible town full of petty crime, unemployment, drug use and pointless violence, I did not care at first, my husband moved in with his new wife, bought a café and everyone was happy, that is until he ran out of money.

Basically my husband is very disillusioned with society and Britain in general and basically he saw loads of people who were cheating laws and expenses and getting more money than he was, so he rounded up his group of friends and they started their own mafia (he in charge of course)

They have a protection ring going around all the businesses (protecting them from all the other local thugs) they sell smuggled goods and stolen property (sold to them for cheap) they run tax frauds, they disguise stolen cars, they run gambling rackets, they extort from other gangs, they con people, they print fake money, they beat people up for money and what I found really shocking is how ruthless and violent they can be, they always seem like a group of mild mannered, nice guys (my ex especially) but they have taken full control of that town so ruthlessly and they deal with any competition extremely violently and everyone is absolutely terrified of them.

On the positive side though, the town has improved so much since they took over it, they have completely stopped a lot of dangerous narcotics because they scared the dealers out of the town, they also have stopped all the petty crime and pointless violence because they get money for keeping it away from the local businesses, they keep a lot of crime out of town and a lot of the elderly there benefit no end, I mean you can actually go out at night now without being robbed because my ex husband has very strict rules about not harming those who don't have it coming, also the gang give thousands every year to various charities and good causes.

Also my ex-husband's crimes have paid off for the family an awful lot, he has become a more respected, church going man (ironic hey) he has paid for my granddaughter to go to private school, he has helped my younger three kids with their money problems, he paid for my house to be decorated as an apology for being a lousy husband, he bought my eldest a house, he helped get my middle two children in London buy an apartment, he also has built up a good inheritance for the 4 of them, he owns a café, a mechanics, a pub, a delivery company and a taxi office, as well as his absolutely beautiful house and his holiday home in Weymouth, England, he also owns a farm in Canada that he plans on retiring to and he has become such a nice guy, he is happy now that he has money and respect.

I was just going to ignore the way he is getting his money knowing that what he is doing is bettering himself, the family and that town and keeping him happy and I have no part in it so even if he does get caught only he will go down for it.

The only issue is he is ever so slightly involving the children, not a huge amount because he has said he wants them to have legitimate careers and lives, but he is involving them, my oldest son is an accountant and does his taxes for him and he is laundering all the illegal money, my middle two children are both lawyers in London and they are giving him under the table legal advice as well as ways to sway the public and my youngest who is not academic at all works in a lot of his father's businesses, although he is not involved with the crime side very much.

So should I report my ex-husband and get him sent down, should I ignore the situation or should I persuade him to do as my third son suggested and get him to faze out the criminal business and work on the legal businesses making him a businessman not a gangster.

Also how at risk are my children from him, the oldest three don't live in the town, the middle two are only giving him under the table advice and my youngest lives with him and works in the legal businesses so I don't think there is anything wrong with that but my oldest son is laundering money for him.

What should I do