GENERAL PART
Chapter VI. COMPLICITY
Article 28. Criminal offense committed by a group of persons, or a group of persons upon prior conspiracy, or an organized group, or a criminal organization
3. A criminal offense shall be held to have been committed by an organized group where several persons (three or more) participated in its preparation or commission, who have previously established a stable association for the purpose of committing of this and other offense (or offenses), and have been consolidated by a common plan with assigned roles designed to achieve this plan known to all members of the group.
EDIT.