Much of it happened after the uproar insueing the murder of Giovanna Reggiani by a Romanian citizen in November. A government decree was issued suposedly cracking down on intra-communitary criminality. The decree has since expired after a legal error in the text. A new decree is in the makings and should be issued, if not as of today. Decrees must be converted into law within 40 days, if I'm not mistaken.

As for blocking illegal exportation of capital such as mafia laundering or Berlusconi shadey deals, it's usually left to police intelligence.