Which study used deception by concealing the researcher’s identity?

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Concealing the researcher's identity means the investigator hides who they are to participants, so people don’t know they’re part of a study. In the Tearoom Trade, Humphreys conducted covert observation of men engaging in sexual acts in public restrooms and did not reveal his role as a researcher. He even followed up with interviews later under a false pretext, using a cover story to locate participants without disclosing his true identity or purpose. This combination of hiding who he was and why he was there allowed him to gather data that wouldn’t have been accessible if he had disclosed his researcher status, though it raises serious ethical concerns about informed consent and privacy. The other famous studies listed employed different kinds of deception (about aims, roles, or procedures) rather than concealing the researcher’s identity to the participants.