Muntean graduated from Moldova State University in 1994. He worked as a jurist for the Ministry of Economy (July 1994 – June 1996), ARIA (1996–2002, August 2006 – April 2007), the office of lawyers "Justil Group".[2] He then served as a deputy of Igor Dodon. In March 2001, Muntean participated with journalists Constantin Tănase, Aneta Grosu, and the folk music singer Maria Sarabaş in a Romanian-Moldovan delegation to Atlanta, where he danced "Hora Unirii", which is contrary to his party's anti-unionist ideology.[3][4] Muntean, however, denies having danced Hora Unirii.[5][6]
In the summer of 2014, Muntean was excluded from the PCRM Executive Committee, then from the position of party executive secretary, and on 23 December 2014 he would be definitively excluded from the Communist Party.[9] About his exclusion from the party, he later said "I was excluded from PCRM for leftist views ... although I am a true third-generation communist."[10]