The omnibus bill, more than 100 pages long and titled "Measures of Support and Growth for the Greek Economy," won passage here in the middle of the night in March, as Parliament raced to meet a deadline set by Greece's creditors.

Only afterward did a legislator from the governing New Democracy party notice an unsettling provision. Buried on page 78 was language that essentially gave retroactive immunity to thousands of workers in state-funded organizations that could shield them from future corruption prosecutions.