If I recall they used Maria Butina’s membership or support for the NRA as a tool to say the NRA are compromised by “The Russians”.
I think that’s right. Here is a article about her sentencing. It mentions the NRA.
https://beta.washingtonpost.com/local/legal-issues/maria-butina-russian-who-conspired-to-infiltrate-the-nra-due-for-sentencing/2019/04/25/3ff24216-66ce-11e9-82ba-fcfeff232e8f_story.html