There is no reference to any "G.A. Sindh Organization" in the documentation available to the IRBDC. However, there is mention of a Jiye Sindh Tahreek (JST), a Jeaye Sindh, a Jeay Sindh and a Jai Sindh, all of which seem to refer to the same organization. There is also mention of a Jiye Sindh, probably the same movement as well. In addition, there is a Jeay Sindh Students Federation (JSSF).
A West German information bulletin describes the Jiye Sindh
Tahreek (JST) as a movement that "represents the interests of the Sindhis in their own province." It also mentions that the "activities of the Jeay Sindh, a separatist organization, [were] banned in the province" of Sindh on 9 September 1989, and that its leader, G.M. Syed, fled to Baluchistan and then to the Punjab, where he was arrested on 10 September 1989 and handed over to Sindh police. The West German bulletin further states that on 19 September 1990, "the president of the Jeaye Sindh, G.M. Syed, [was] released from prison and proceedings against him [were] halted." (Pakistan - Delegierter für das Fluchtlingswessen). According to the Far Eastern Economic Review, the Jiye Sindh is a Sindhi chauvinist movement that "plays upon the Sindhis' resentment against the constant influx of non-Sindhis into the province" (Far Eastern Economic Review 14 June 1990 p.22). Finally, Revolutionary and Dissident Movements lists the Jai Sindh in a section entitled "Separatist Groups" and refers to it as one of the "new nationalist groups" that emerged as a result of the civil unrest in August 1983 and August 1986 (Degenhardt p. 264). No further information on this group is currently available to the IRBDC.
The Jeay Sindh Students Federation (JSSF) is an organization founded on 17 January 1972. Its professed aims are "to help needy and poor students; to struggle for the basic human rights of people of Sindh Province; to make efforts to unite youth via one platform; to struggle for freedom in Sindh; struggle for the solution to youth problems." It publishes a monthly magazine in the Sindhi language called Paigam -i- Sindh (Angel p. 421).
Bibliography

Angel, William D. 1990. Youth Movements of the World. Harlow, Essex: Longman Group UK Ltd.

Degenhardt, Henry W. Ed. 1988. Revolutionary and Dissident Movements: An International Guide. Burnt Mill, Essex: Longman Group UK Ltd.

Far Eastern Economic Review. 14 June 1990. Ali, Salamat. "Home Fires Burning."

Pakistan - Delegierter für das Fluchtlingswessen. May 1990. (Translation available at the IRBDC in Ottawa)

Attachments

Angel, William D. 1990. Youth Movements of the World. Harlow, Essex: Longman Group UK Ltd. P. 421.

Degenhardt, Henry W. Ed. 1988. Revolutionary and Dissident Movements: An International Guide. Burnt Mill, Essex: Longman Group UK Ltd. P. 264.

Far Eastern Economic Review. 14 June 1990. Ali, Salamat. "Home Fires Burning." P. 22.

Pakistan - Delegierter für das Fluchtlingswessen. May 1990. Relevant pages of French translation (the document is not paginated.)