Final answer:
The U.S. law that forbids off-the-book bribes in the domestic anticorruption battle is the Honest Leadership and Open Government Act. This act prohibits certain activities like providing gifts to lawmakers and compensating lobbyists with commissions. Violators can face fines, bans from lobbying, or imprisonment.
Step-by-step explanation:
The U.S. law that is a tool in the domestic anticorruption battle, forbidding off-the-book bribes, is the Honest Leadership and Open Government Act. This act prohibits certain activities such as providing gifts to lawmakers and compensating lobbyists with commissions for successful lobbying. It also includes revolving door laws that prevent lawmakers from immediately lobbying after leaving public office. Violators of the law can face fines, bans from lobbying, or even imprisonment.