A Pennsylvania Casino Association official wrote in a response letter that its activities didn't meet the state's legal definition of lobbying.
The association sent e-mails to legislators and aired a radio ad.
House Gaming Oversight Committee Chairman Dante Santoni sent a letter last month citing the group's activities surrounding a bill to expand casino gambling.
Santoni says he hasn't decided whether to hold a hearing on the matter.
The Pittsburgh-based casino association is chaired by former state Supreme Court Chief Justice Stephen Zappala.