<p>The purpose of the present article is to make
an effective proposal for combating terrorist attacks related to illegal
migration. It is stated that terrorist attacks and illegal immigration are
organized criminal phenomena that are occasionally interconnected. The
peculiarity of these crimes is that they radically affect societies and that
combating preparatory illegal acts for their perpetration does not restrain the
entire criminal activity. Under these circumstances it results that undercover
operations are an effective, penetrative means of preventing organized criminal
activities. Finally, it is concluded that the confluence of two particularly
serious crimes leads to the proposal for adopting a new (more penetrative) type
of undercover operation through the
prism of the principle of proportionality.<br></p>