Nine people conspired to buy votes in the May 2010 primary election in Breathitt County, a federal grand jury charged Friday.
In one indictment, the grand jury said Michael Salyers, 47; Naomi Johnson, 61; Jackie Jennings, 61, and Earl Young, 44, conspired to buy votes.
The grand jury also charged Salyers with seven counts of paying voters; Johnson and Jennings with one count each of buying votes; and Young with one count of paying a voter, according to a news release from the office of U.S. Attorney Kerry B. Harvey.
The four are from Breathitt County.
In a separate indictment, the grand jury charged Paula Jean Noble, 43; Joseph Strong, 50; Richard L. Turner, 53; George Daniel Strong, 53; and Woodrow Glenn Burton, 37, with conspiring to buy votes, according to the news release.
The grand jury also charged each with at least one count of vote-buying.
Noble also was charged with lying in March to a grand jury that was hearing testimony in the investigation.
All the people named in that second indictment are from Breathitt County except Turner, who is from Owsley County, according to Harvey's office.
The investigation led to federal charges because there was a race for U.S. Senate on the ballot in May 2010.
The charges carry a maximum sentence of five years in prison.
The FBI and the Kentucky attorney general's office investigated the case.