"A House committee is investigating whether the coal industry's largest influence group failed to accurately report its lobbying spending to Congress.
The Select Committee on Energy Independence and Global Warming has expanded its investigation into forged letters sent to lawmakers and their ties to the American Coalition for Clean Coal Electricity, according to documents viewed by E&E.
In an Oct. 21 letter, Chairman Ed Markey (D-Mass.) asked ACCCE whether its lobbying disclosure for 2008 and the first half of 2009 should have included work conducted by the Hawthorn Group, a public relations firm hired in part to coordinate efforts to fight the House climate bill."
"U.S. Chamber Sues Group After Impersonation Fiasco" (The Hill)
"Toyota: We're Staying In US Chamber of Commerce" (Guardian)
"Fact Checking the Chamber of Commerce" (Mother Jones) 
"Chamber Uses Yes Men Attack To Fundraise" (Mother Jones)