R. Kelly’s alleged manager is facing more legal fallout over what the feds claim are efforts to run interference for the disgraced singer.

Donnell Russell has just been charged by the U.S. Department of Justice for an alleged threat to shoot up an NYC theater in December 2018 when the Lifetime documentary, “Surviving R. Kelly,” was being screened there.

The feds claim Russell admitted to first sending a cease-and-desist letter trying to end the screening — but when that failed, prosecutors allege he phoned in the shooting threat … and successfully nixed the event, which was being attended by a number of Kelly’s alleged victims.

360aproko broke the story … law enforcement sources told us an R. Kelly associate was a person of interest over an alleged threat that came in just 20 minutes before the start of the screening. Russell was charged with 1 count of conspiracy to threaten physical harm and 1 count of threatening physical harm. Each charge carries a max sentence of 5 years in prison. This, of course, is just the tip of the legal iceberg for Russell.

As we reported … Russell is also 1 of 3 people charged for allegedly harassing and intimidating witnesses in Kelly’s criminal cases.