"Follow the money" is a catchphrase popularized by the 1976 docudrama film All the President's Men, which suggests political corruption can be brought to light by examining money transfers between parties.
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Money trail in the context of Influence peddling
Influence peddling, also called traffic of influence or trading in influence, is the practice of using one's influence in government or connections with authorities to obtain favours or preferential treatment for another, usually in return for payment. Influence peddling per se is not necessarily illegal, as the Organisation for Economic Co-operation and Development (OECD) has often used the modified term "undue influence peddling" to refer to illegal acts of lobbying; however, influence peddling is typically associated with corruption and may therefore delegitimise democratic politics with the general public. It is punishable as a crime in Argentina, Belgium, Bulgaria, Brazil, France, Hungary, Italy, Lithuania, Mexico, Portugal, Romania, Spain, and the United Kingdom.