Kalito writes...

I know that before the events of the last episode of YJ Season 3 the Justice League got restrained in dealing with problems, even with helping with humanitarian efforts after disasters, thanks to restrictions placed by the United Nations ever since Lex Luthor became UN Secretary-General. But did the League ever think of trying to expose him for his criminal activities in the first place so that he can be removed from his position and maybe even arrested?

Note: I thought of this from that episode of Young Justice Season 2 called "Summit" in which the Reach finally got exposed for their evil nature after the young heroes got the evidence they needed to do so and it didn't take years to do that. Plus after remembering Benson Fuhrman (Who's real last name is Hairmore) from an episode of Scooby-Doo! Mystery Incorporated Season 2 called "Scarebear".
https://scoobydoo.fandom.com/wiki/Benson_Fuhrman