527 contributions: Wisconsin donors gave secretive 527 groups more than $1.5 million in 2009, a record for a non-election year. The Wisconsin Democracy Campaign also finds that Dem 527s pulled in about two-thirds of the overall money given to the organizations, continuing a trend that began in 2006.-- WisPolitics report.
Even the Wisconsin Democracy Campaign (WDC) didn't call 527s "secretive," though. Maybe that's because 527s are required to report all of their contributions, which is where the WDC report came from.