By VICKI SMITHMORGANTOWN, W.Va. (AP) â¿¿ A former superintendent in prison for his actions at the Upper Big Branch mine says his lawyer was ineffective, had conflicts of interest and made him a scapegoat for the 2010 disaster that killed 29 coal miners to help protect former Massey Energy executives from prosecution. Gary May has asked a judge to set aside or change the 21-month sentence he's now serving at the Federal Correctional Institution at Morgantown. U.S. Magistrate Clarke VanDervort hadn't scheduled a hearing as of Tuesday afternoon. May said defense attorney Tim Carrico refused to let him testify that illegal advance warning of safety inspections was common practice at former Massey Energy operations now owned by Virginia-based Alpha Natural Resources. May said more than 100 people at Upper Big Branch participated in the unwritten scheme, but he was muzzled to protect executives including Chris Blanchard and Don Blankenship from prosecution in the worst U.S. coal mining disaster in four decades. Blanchard was the president of Performance Coal Co., the Massey subsidiary that ran the mine near Montcoal. Blankenship was Massey's CEO. May claims that longtime Massey general counsel Shane Harvey was among those directing Carrico's actions. Carrico didn't immediately return a phone message, but Harvey denied he had any involvement in May's case or his attorney's defense strategy. May said that prosecutors were "looking for a villain," and that he "became an easy scapegoat for the U.S. Attorney's Office to relieve public pressure with a conviction and became a sacrificial lamb for Massey and its corporate successor, Alpha." Assistant U.S. Attorney Steve Ruby declined comment. Earlier this month, Berger sentenced another Massey executive â¿¿ former White Buck Coal Co. president David Hughart â¿¿ to 3 1/2 years in prison for his role in the advance-warning system that he testified was common at Massey mines. At his plea hearing, he implicated Blankenship in the conspiracy.