Short answers, pulled from the story.
The Communist Party of Workers and Peasants (KPRS) was a Ukrainian political party formed in 2001 following a split from the Communist Party of Ukraine. It operated for fourteen years before being banned and terminated by court order on the 30th of September 2015.
Ukraine's decommunization laws, which came into effect in May 2015, banned communist symbols and the singing of Soviet anthems. The Ministry of Justice stripped the party of its right to participate in elections on the 24th of July 2015, and the party did not challenge the ban, leading to its termination by the District Administrative Court in Kyiv.
In the 2002 Ukrainian parliamentary election, the party received 0.41% of the popular vote and won no seats. It did not participate in any subsequent nationwide election.
Leonid Hrach was elected chairman of the KPRS in February 2011. At the time he was a member of the Ukrainian parliament, though he lost his parliamentary seat after the 2012 election.
The party was formally terminated on the 30th of September 2015 by the District Administrative Court in Kyiv, following decommunization legislation that stripped it of its electoral rights.
Hrach ran as an independent candidate in single-member districts number 1 in the Autonomous Republic of Crimea and lost, failing to return to parliament. His party did not participate in the 2012 election.