Bribing Statistics by Aleks Jakulin.
Self reporting (I paid a bribe is the name of the application) of bribery in the United States is uncommon, at least characterized as a bribe.
There are campaign finance reports and analysis that link organizations/causes to particular candidates. Not surprisingly, candidates vote in line with their major sources of funding.
The reason I mention it here is to suggest that topic maps could be used to provide a more granular mapping between contributions, office holders (or agency staff) and beneficiaries of legislation or contracts.
None of those things exist in isolation or without identity.
While one researcher might only be interested in DARPA contracts (to use a U.S. based example), the contract officers and the beneficiaries of those contracts, another researcher may be collecting data on campaign contributions that may include some of the beneficiaries of the DARPA contracts.
Topic maps are a great way to accumulate that sort of research over time.