Who did Hera Harm? And How did Hera Harm that person?

Hera harmed Zeus by drugging him in his drink and then conspiring with others she tied him to his chair.

Explanation:

Hera was Zeus happily wedded wife. However, their happy moments did not last long when Hera came to know about her husband's infidelities. Zeus being a promiscuous-men was involved in a series of extramarital affairs with several other beauties of his time. Hera was extremely annoyed at this turn of Zeus. She finally conspired with the other Gods and drugged him in his drinks and got him tied into his chairs with a hundred knots. They even snatched his thunderbolt from him. All of this was done when Zeus was drugged in his sleep. As Zeus was awakened by the rumbling of his fellow compatriot, he unshackled the chains and punished Hera for her actions.