An Indiana judge sentenced two of the men found guilty of robbing casino winners to 50 years in prison.
Kenyatta Erkins and Ugbe Ojile are already serving 31 years behind bars in Ohio.
The two sentences will run consecutively.
Erkins, Ojile and a woman were arrested in October 2010 in an undercover operation.
Prosecutors say they followed riverboat casino patrons back to Ohio from Indiana and robbed them at gunpoint.
There were at least a dozen robberies over several months.