Captain Sleeman was associated with the suppression of thugs.

Explanation:
Thugs were a notorious criminal group in India who were involved in ritualistic murder and robbery. They operated in large numbers across the country and were a major threat to public safety. The British East India Company took several measures to suppress the thugs, including the appointment of Captain William Henry Sleeman to lead the operations against them.

Captain Sleeman was a British soldier and administrator who was appointed as the Commissioner of the Saugor and Nerbudda Territories in Central India. He was given the responsibility of investigating and suppressing the activities of the thuggee cult. He organized a large network of informants and spies and conducted extensive investigations to identify the members of the cult.

Under Captain Sleeman's leadership, a large number of thugs were arrested and tried in court. He introduced new laws to make it easier to convict the thugs and increased the penalties for their crimes. He also created a database of the known thugs and their modus operandi, which helped the authorities to track them down more easily.

Captain Sleeman's efforts were highly successful in suppressing the thuggee cult. He is credited with arresting and convicting over 4,000 thugs during his tenure. His work also inspired other administrators to take similar measures against other criminal groups in India.

In conclusion, Captain Sleeman was a key figure in the suppression of thugs in India. His efforts were instrumental in reducing the threat posed by this notorious criminal group and improving public safety in the country.