An Internet site that let [users / uses] change real money for digital currency has been shut [up / down] by the USA's Department of Justice (DOJ). The site, called Liberty Reserve.com, was a [palace / place] for criminals around the world to [launder / laundry] money. Money laundering is when "dirty cash" from drugs, robberies, etc. is changed [onto / into] "clean money" that the crime gangs can use. Criminals laundered - [changed / charged] - more than $6 billion [using / uses] Liberty Reserve. Police are investigating [locates / locations] in 17 countries and have taken away [dozens / dozes] of computers and hard disk drives. They hope these can help them find out more about how Liberty Reserve operated. The DOJ says this is the largest [cause / case] of money laundering ever. Liberty Reserve.com looked like a website for people to change dollars, euro and [another / other] currencies into digital money. Owners of other digital cash sites say [this / these] system makes it easier and cheaper [for / to] transfer money [around / through] the world. However, the DOJ says Liberty Reserve was started with the main purpose of laundering money. It says the website was [resigned / designed] , "to help criminals [conduct / contract] illegal transactions and launder the [precedes / proceeds] of their crimes". It added the site was, "a financial hub of the cyber crime world" that allowed credit card [theft / thief] , investment fraud, hacking, child pornography and drug [trafficking / jamming] . Many honest people who used Liberty Reserve are [moment / now] worried they have lost their money.