American Petroleum Institute, public relations firm split up
API has paid more than $327 million to Edelman in five years; association to continue relationship with spinoff Blue Advertising
Read MoreAssociations' lobbying tab surpasses $1 billion in 2014
At least 148 trade groups, professional societies spent $1 million or more on lobbying; 10 groups reported $10 million-plus
Read MoreAs drones soar in popularity, so does association interest
Drones are already represented by a trade group, but others see opportunities in appealing to the fast-growing tech industry
Read MoreThe big winners in association lobbying? The PR firms
Analysis of tax documents finds business groups spent more than $1.2 billion on outside public relations during five-year period
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