On 24 November 1970, Horbal was arrested by the
KGB and charged with Anti Soviet Agitation and Propaganda. He was sentenced to 5 years imprisonment and 2 years exile in
Siberia. On release from prison and return to Ukraine, Horbal settled in
Kyiv, where he joined the
Ukrainian Helsinki Group which had formed in 1976. All of the members of the group were arrested, and on October 23, 1979, Horbal was arrested and sentenced to 5 years hard labour. In 1984, having completed the 5-year term, Horbal was not released from incarceration, but was immediately sentenced to another term of 8 years of hard labour and 3 years in exile. However, this sentence was terminated in 1988 during
Perestroika. == Political career ==