Gucci Mane Blasts Prison Holding Pooh Shiesty

Gucci Mane is demanding justice for his artist Pooh Shiesty ... after claiming he was transferred to a prison where he's being subjected to cruel and unusual conditions.

The 1017 Records label boss fired off his accusations Wednesday, tweeting about Pooh only getting one hour out of his cell each day, and getting food trays ... without any food on them.

Gucci's allegation is echoed by Pooh's attorney Bradford Cohen, who claims his client has been in 23-hour lockdown each day ... for about the last 6 months at FCI Pollock in Louisiana.

He also claims prison officials are screwing with Pooh's mail -- holding back letters from family and fans, and blocking mail he sends out to loved ones.

Cohen says it took him 2 to 3 weeks just to set an appointment with Pooh, and claims his family's having an even harder time visiting him.

We're told when Pooh was convicted for firearm possession -- related to a 2020 shootout in southern Florida -- he asked to do his time at a prison about 200 miles from his Tennessee home. Instead, he was sent to Pollock ... which is about 1500 miles away from his kinfolk.

Distance aside, he can't have visitors while in lockdown, anyway -- so Cohen says it's a virtual impossibility for Pooh to see his fam.

The Federal Bureau of Prisons declined to comment on the specific allegations -- but said there are several factors that determine where an inmate is placed ... such as the level of supervision needed and/or medical needs.