Company says it is 'taken aback' by the Labor Department's claim.
Applications have remained below 300,000, a historically low level, for 108 weeks.
Found members of his church were urged to volunteer at the buffet and it used the unpaid workers.
The number of people receiving benefits fell 39,000 to 2 million.
Alexander Acosta is testifying before the Senate Health, Labor, Education and Pensions Committee.
Costume fees cut earnings.
Back wages will be paid to more than 16,000 workers.
Senate committee will hear from Alexander Acosta March 22.
Gains today led by technology, industrial companies.
2016 had smallest gain since 2011.