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

The established threshold of $100,000 for anti-lobbying activities is indeed associated with the Byrd Amendment. This amendment, officially known as the Anti-Lobbying Act, was enacted in the 1980s to limit federal funding for lobbying activities and requires organizations that receive federal funds to certify that they will not use those funds for lobbying purposes. The specific threshold of $100,000 relates to the total amount of federal funds awarded to an entity, above which the organization must comply with the anti-lobbying provisions. This was designed to ensure transparency and accountability regarding how federal funds are utilized, particularly in relation to influencing legislation or government action.

In contrast, the other options do not pertain to the anti-lobbying threshold. The Bayh-Dole Act primarily addresses patent rights for inventions developed with federal funding, the Shelby Amendment relates to the prohibition of certain disclosures or uses of funds in relation to federal contracts and grants, and the Davis-Bacon Act focuses on prevailing wage laws for laborers and mechanics on federal projects. These legislative acts serve different purposes and do not regulate lobbying activities or establish thresholds similar to those defined by the Byrd Amendment.