The general statute of limitations for claims of breach of fiduciary duty under the Employee Retirement Income Security Act is six years. But if the plaintiffs had “actual knowledge of the breach or violation,” the deadline for suing is shortened to three years from the date of enlightenment. 29 U.S.C. § 1113(2). Applying the three–year deadline, a district judge granted a defense request for summary judgment on the ERISA complaint that former employees of The Antioch Co. filed against GreatBanc …