攻守同盟是指犯罪嫌疑人为了逃避法律制裁，隐瞒犯罪事实真相，相互之间以及与有关证人、利害关系人暗中约定，提供假供、伪证的行为。在贪污贿赂案件中，犯罪嫌疑人主要通过订立攻守同盟的方式，实施反侦查，给查证工作既带来了困难，也提出了挑战。一随着反贪力度的加大，攻 Offensive and defensive alliances refers to the suspects in order to evade legal sanctions, conceal the truth of the facts of the crime, with each other and with the relevant witnesses, stakeholders covertly agreed to provide false testimony, perjury. In cases of corruption and bribery, criminal suspects, mainly through the establishment of offensive and defensive alliances, have carried out counter-investigations and brought both difficulties and challenges to the verification work. With the intensification of anti-corruption, attack