Which amendment set up the anti-lobbying threshold of $100,000?

The Byrd Amendment is the legislation that established the anti-lobbying threshold of $100,000. This amendment pertains to the restrictions on federal funds being used for lobbying activities, which means that if an organization receives federal funding above this amount, it must disclose its lobbying activities and expenses. The intent behind the Byrd Amendment is to ensure transparency and accountability in how taxpayer dollars are utilized, especially when it comes to influencing government decisions and policy-making.

In the context of the other options, while they each have significance in their respective areas, they do not specifically address anti-lobbying measures. The Bayh-Dole Act deals with patent rights for federally funded research, the Shelby Amendment addresses certain regulatory processes, and the Davis-Bacon Act pertains to wage rates for laborers on public works projects. These acts do not relate to the anti-lobbying threshold set forth by the Byrd Amendment.