The CPI (M) on Wednesday demanded sacking of Telecom Minister A Raja alleging that the 3G spectrum auction convincingly proved his involvement in corrupt practices in the sale of 2G spectrum. <br/><br/>The CPI(M) Politburo in a statement said the outcome of the 3G spectrum auction convincingly proves that Union Communication Minister A Raja was clearly involved in corrupt practices by selling 2G spectrum to some industrialists by manipulating TRAI recommendations. The party has demanded he should quit his post immediately.