If they were a private business they would not have been given tax-exempt status. I guess that was a good way to launder russian $$.
The National Rifle Association acted as a "foreign asset" for Russia in the period leading up to the 2016 election, according to a new investigation unveiled Friday by Sen. Ron Wyden, D-Ore.
Drawing on contemporaneous emails and private interviews, an 18-month probe by the Senate Finance Committee's Democratic staff found that the NRA underwrote political access for Russian nationals Maria Butina and Alexander Torshin more than previously known — even though the two had declared their ties to the Kremlin.

The report,
available here, also describes how closely the gun rights group was involved with organizing a
2015 visit by some of its leaders to Moscow.
Then-NRA vice president Pete Brownell, who would later become NRA president, was enticed to visit Russia with the promise of personal business opportunities — and the NRA covered a portion of the trip's costs.