Miller's committee has heard testimony that they can eat up half the income in some 401(k) plans over a 30-year span. But he has not been able to stop it.
"We tried to just put in some disclosure and transparency in these fees. And we felt the full fury of that financial lobby," he said.
David Wray, a lobbyist for the 401(k) industry, says he favors disclosing the fees, but his partners in the financial industry don't.
Asked if he thinks most people know these fees exist, Wray said, "I think they know that there are fees. They don't know exactly how large they are."
"Why do you think the financial services industry is opposed to fee transparency?" Kroft asked.
"I don't know that they're opposed to it. I think the issue is that…," Wray replied.
"You don't think they're opposed to it?" Kroft asked. "You're a lobbyist in Washington, right? You know they're opposed to it. …George Miller hasn't been able to get a bill to the floor."
"I think they want to keep the systems as simple and not make changes. They like the way things are. And whenever you push people out of their comfort zones, you know, it's an issue," Wray replied.
"I mean, they're comfortable with the situation because they're making a ton of money or they have made a ton of money," Kroft said.
"Well, and their systems are set up in certain ways. You know, this is gonna be a big change," Wray replied.
60 Minutes wanted to ask Wray, who's been so bullish on 401(k) plans, one last question about what the future holds for people like Terry and Donna McNally and Kathleen Coleman.
"Most of the people that we've talked to are 50 and 60 years old and have sustained these losses say there is no way they're ever gonna make them back. Do you agree with that?" Kroft asked.
"I think we have to be truth tellers," Wray replied. "I think that when a person has hit this point, and we've had this unfortunate situation, I don't think we can misrepresent what the possibilities are."
"And reality is that money's not coming back that they've lost," Kroft said.
"They can't count on it," Wray replied. "They have to…it may. Maybe they have long, maybe if they work ten more years, it'll come back by the…but it's important that they not have unrealistic expectations."
Produced by Ira Rosen