February 23 and November 8 in 2021. 2. In response, on January 26, 2022, Complainant filed the constitutional complaint in this case, arguing that Article 83, Section (3) of the Telecommunications Business Act, which sets forth that telecommunications business operators may provide users’ personal information at the request of investigative agencies, violated the rule against excessive restriction, rule of clarity, and principle of warrant and, thus, infringed upon his fundamental rights. D. 2022Hun-Ma126 1. Complainants are people who use the telecommunications service provided by telecommunications business operators, Companies A, B, and C. 2. Complainants became aware of the fact that Respondents had acquired their communications data as described in Appendix 4, and filed the constitutional complaint in this case on January 28, 2022, alleging that their right to informational self-determination, etc. are infringed both by Respondents’ communications data acquisition activities listed in Appendix 4 and by Article 83, Section (3) and the proviso of Article 83, Section (4) of the Telecommunications Business Act, which are the legal basis of the acquisition. Ⅱ. Subject Matter of Review A. 2016Hun-Ma388 1. Complainants J.S. et al. are challenging the constitutionality of the communications data acquisition activities listed in Appendix 3. 2. Furthermore, Complainants are also challenging the constitutionality - 24 -