Abstract: the article is devoted to the problematic issues of countering extremist-terrorist activities on the Internet. Based on the analysis of the legislative base of the Russian Federation, the priority tasks of preventing and solving crimes of an extremist and terrorist nature are highlighted. As much of the information posted on the Internet is accessible to an unlimited number of people, and the process of its distribution does not lend itself to complete control by the authorities, the documentation of this category of criminal attacks has a number of organizational and tactical features. At the same time, it is emphasized that the most frequently used as a means of communication are social networks that have a certain degree of anonymity and allow the use of conspiracy methods in the course of carrying out actions of an extremist-terrorist orientation. The key position in identifying and disclosing the types of crimes in question is considered by the authors to be the activities of the operational units of the internal affairs bodies in identifying, verifying and further using reliable primary information. At the same time, they propose a specific algorithm of actions for identifying persons engaged in extremist-terrorist activities using information and communication media and various Internet resources. The efficiency of this algorithm is confirmed by practical examples of the actions of one of the units of the Ministry of Internal Affairs of Russia to verify information against a person who used social networks to distribute materials containing appeals for terrorist and extremist activities.
Keywords: extremism, terrorism, operational-search activity, Internet, crime, counteraction, disclosure