TY JOUR TI THE LEGAL GROUND FOR INVESTIGATIVE ACTIONS AS A FEATURE OF THEIR SYSTEMATISATION KW criminal procedure KW investigative actions KW common rules KW legal ground KW systematization KW internal structure KW preparatory stage KW constitutional rights restriction KW secret protected by the law JO Volgograd Academy of the Ministry of the Interior of Russia AU Aleksandrova, L.A. PY 2026 IS 0 PB Volgograd Academy of the Ministry of Internal Affairs of Russia