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The investigation began in August 2012, the filing shows. The document notes that Judge Gregory Peterson, the state judge overseeing the probe, granted a request from Club for Growth members in January to quash five subpoenas and return materials obtained during the investigation.

It’s still not known what was seized and it’s unclear who received subpoenas beyond Club for Growth. The Wall Street Journal has reported the other targets were Walker’s campaign, Wisconsin Manufacturers & Commerce and the conservative group Citizens for a Strong America.