Without more context, it’s hard to answer your question, but I’ll try. Hearings are official meetings to exam some issue. The hearing could be like a trial before a judge, or in this case, a meeting of government officials. Apparently, there are hearings before the state government involving the mayor. The mayor says that the state government may be attacking his city (Wheelsy) with biological weapons because they don’t like his behavior at the hearings. That sounds ridiculous, so he’s either paranoid or it may make sense in the movie.