Miners for Democracy (MFD) formed in April 1970, while the DOL investigation of the 1969 election continued. Its members included most of the miners who belonged to the West Virginia Black Lung Association and many of Yablonski's supporters and former campaign staff. MFD's support was strongest in southwestern Pennsylvania, eastern Ohio, and the panhandle and northern portions of West Virginia, but MFD supporters existed in nearly all affiliates. The chief organizers of Miners for Democracy included Yablonski's sons, Joseph (known as "Chip") and Ken, Mike Trbovich, and other union supporters.