We can read on the USAID web site (which is “From the American people”) that:
In broad terms, USAID focuses on corruption as the misuse of public office for private gain. It encompasses abuses by government officials such as embezzlement and nepotism, as well as abuses linking public and private actors such as bribery, extortion, influence peddling, and fraud. Corruption arises in both political and bureaucratic offices and can be petty or grand, organized or unorganized. Though corruption often facilitates criminal activities such as drug trafficking, money laundering, and prostitution, it is not restricted to these activities.