Question: When did Gorbachev remove Jumber Patiashvili as First Secretary of the Georgian Communist Party?
About the article "Dissolution of the Soviet Union", section "Georgia – massacre in Tbilisi".

Candidate passages:
Jumber Patiashvili () (born January 5, 1940) is a Georgian politician.
He was the Communist leader of the Georgian SSR from 1985 to 1989.
Born in Lagodekhi, Kakheti (eastern Georgia), he graduated from Tbilisi Agricultural Institute.
From 1966, he worked for Komsomol and subsequently from Communist Party.
Patiashvili, a nondescript party loyalist, succeeded Eduard Shevardnadze as the First Secretary of the Georgian Communist Party in 1985.
Under Patiashvili, most of Shevardnadze's initiatives atrophied, and no new policy innovations were undertaken.
Patiashvili removed some of Shevardnadze's key appointees, although he could not dismiss his predecessor's many middle-echelon appointees without seriously damaging the party apparatus.
By isolating opposition groups, Patiashvili forced reformist leaders into underground organizations and confrontational behavior.
By the end of 1988, Georgian national movement became more active, several manifestations and hunger strikes were organized by the so-called informal political organizations.
The protesters were brutally dispersed by the Soviet troops on April 9, 1989.
Following the April 9 Massacre, the Georgian national liberation movement radicalized and left little chance to a local communist leadership to control the situation in the Republic.
Patiashvili was removed from his office and replaced by the former KGB chief Givi Gumbaridze the same month.
He was elected MP in the Georgian parliament of 1992-1995.
Patiashvili returned to the national politics prior to the 1999 parliamentary elections.
He organized an oppositional Unity (ertoba in Georgian) party joining the oppositional bloc united behind the Democratic Revival Party led by Aslan Abashidze, regional leader of Ajaria, and was elected in the Parliament of Georgia.
Later, he distanced himself from Abashidze, remaining, however, in opposition to Eduard Shevardnadze’s government.
His party took part in the oppositionist demonstrations which led to the Rose Revolution in November 2003.
He was elected MP for Gori district in 2004.
He ran in the May 2008 Parliamentary election from the Gori constituency on the Rightist Alliance–Topadze-Industrialists bloc ticket. 
On April 7, 1989 troops and armored personnel carriers were sent onto the streets of Tbilisi after more than 100,000 people gathered in front of the Government and Communist Party headquarters, many with banners calling for Georgia to secede from the Soviet Union and urging the full integration into Georgia of the autonomous region of Abkhazia.
On 9 April 9, 1989 at least sixteen people were killed and more than 200 wounded when troops attacked the peaceful demonstrators.
This event radicalised Georgian politics, prompting many to conclude that independence was preferable to continued Soviet rule.
On 14 April 1989 Gorbachev removed Jumber Patiashvili as First Secretary of the Georgian Communist Party for his poor handling of the April events and replaced him with the former Georgian KGB chief Givi Gumbaridze.
On July 16, 1989 in Sukhumi capital of Abkhazia a protest against the opening of a Georgian university branch in the town led to violence that quickly degenerated into a large-scale inter-ethnic confrontation in which 18 died and hundreds were injured before Soviet troops restored order.
This riot marked the start of the Georgian-Abkhaz conflict.
The anti-Soviet movement became more active in the Georgian SSR in 1988.
Several strikes and meetings were organized by anti-Soviet political organizations in Tbilisi.
The conflict between the Soviet government and Georgian nationalists deepened after the so-called Lykhny Assembly on March 18, 1989, when several thousand Abkhaz demanded secession from Georgia and restoration of the Union republic status of 1921–1931.
In response, the anti-Soviet groups organized a series of unsanctioned meetings across the republic, claiming that the Soviet government was using Abkhaz separatism in order to oppose the pro-independence movement.
The protests reached their peak on April 4, 1989, when tens of thousands of Georgians gathered before the House of Government on Rustaveli Avenue in Tbilisi.
The protesters, led by the Independence Committee (Merab Kostava, Zviad Gamsakhurdia, Giorgi Chanturia, Irakli Bathiashvili, Irakli Tsereteli and others) organized a peaceful demonstration and hunger strikes, demanding the punishment of Abkhaz secessionists and restoration of Georgian independence.
Local Soviet authorities lost control over the situation in the capital and were unable to contain the protests.
First Secretary of the Georgian Communist Party Jumber Patiashvili asked USSR leadership to send troops to restore order and impose curfew. 
 Mamia Orakhelashvili (March 1921 - April 1922) Mikheil Okudzhava (April - 22 October 1922) Besarion Lominadze (25 October 1922 - August 1924) Mikheil Kakhiani (August 1924 - May 1930) Levan Gogoberidze (May - 19 November 1930) Samson Mamulia (20 November 1930 - 11 September 1931) Lavrenty Kartvelishvili (11 September - 14 November 1931) Lavrentiy Beria (14 November 1931 - 18 October 1932) (1st time) Petre Agniashvili (18 October 1932 - 15 January 1934) Lavrentiy Beria (15 January 1934 - 31 August 1938) (2nd time) Candide Charkviani (31 August 1938 - 2 April 1952) Akaki Mgeladze (2 April 1952 - 14 April 1953) Alexander Mirtskhulava (14 April - 19 September 1953) Vasil Mzhavanadze (20 September 1953 - 29 September 1972) Eduard Shevardnadze (29 September 1972 - 6 July 1985) Jumber Patiashvili (6 July 1985 - 14 April 1989) Givi Gumbaridze (14 April 1989 — 15 November 1990) (continued as the First secretary in opposition to 7 December 1990)  
The lingering ethnic discord in Abkhazia exacerbated when, on March 18, 1989, the Abkhaz élites, who viewed an increasingly active movement for Georgia's independence as a threat to their political privileges of a "titular minority" and the status of autonomous republic, signed a petition to the central Soviet government at a mass meeting at Lykhny, Abkhazia, demanding the rights to secede from Georgia.
The move caused mass protests from the Georgian community, which accounted for by far the largest single group in (45,7%) of the population of the Abkhaz ASSR, and were resolutely opposed to any diminution of their links with the Georgian republic, holding rival demonstrations within Abkhazia and within Georgia proper.
The protests climaxed in the Georgian capital of Tbilisi and evolved into a major anti-Soviet and pro-independence rally on April 9, 1989, which was violently dispersed by the Soviet Interior Ministry troops, resulting in the deaths of twenty, mostly young women, and the injury of hundreds of demonstrators.
At a plenum of the Georgian central committee the following day the Communist party first secretary, Jumber Patiashvili, resigned and was replaced by the former head of the Georgian KGB, Givi Gumbaridze.
The April 9 tragedy removed the last vestiges of credibility from the Soviet regime in Georgia and pushed many Georgians into radical opposition to the Soviet Union.
Meanwhile, the Abkhaz remained largely loyal to the Soviet rule partly to antagonize the Georgian movement and partly to obtain Moscow’s sympathy towards their cause.