"Jeffrey Cox" is on the meme, but he goes by J. David Cox.
I searched a little, but couldn't find any other info that J. David Cox really does oversee guards at MCC where Epstein was held and died. Unless as president of AFGE he's considered "overseer" of prison guards? I dunno. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Found in the comments on the tweet, a story about this J. David Cox being accused of sexual harassment, but it's at Bloomberg. So I searched and found this one, among others:
Major federal workers union president accused of sexual harassment
The president of the nation’s largest federal government workers union has been accused of sexually harassing several subordinates, including one employee whose ear he licked during a hug last year, according to a new report.
More:
https://nypost.com/2019/10/28/major-federal-workers-union-president-accused-of-sexual-harassment/