Are landlords required to notify you of sex offenders?

I live in Connecticut in a small privately owned "house" which has been made into three apartment units. The people who reside in the apartment unit above me have been giving me a difficult time since I moved in their behavior is immature and borderline hostile, our landlord refuses to discuss matters with them and simply tells me, "If you don't like it, move". A couple weeks ago, I grew really suspicious of why he seems to be almost protecting the people above us despite their ridiculous antics. My boyfriend and I had a couple friends over, they brought their 8 month and 13 months old daughters with them. It wasn't very late at night, nine at the latest and everyone was gone before midnight, we kept the noise level as low as possible. One of the babies went to prop herself up, slipped and hit her head, this of course lead to crying and screaming, because she was crying the other one started crying. Apparently the people upstairs had a huge problem with this because they started slamming doors, pounding their feet on the floor, and screaming; which only scared the children and made them cry more. I went to the landlord about this because that type of outburst was absolutely disgusting and I really didn't see him ignoring our concerns if children were involved. I was wrong, he got really tense and was more or less yelling he stated, "Kids shouldn't be in there, that place wasn't made for kids!" I was surprised at this because no place is built specifically for young kids and it's not as though they lived there. After his explosion he calmy admitted that he couldn't tell us we couldn't have certain people in our home but still refused to talk to them about their behvior. Ever since then I've wondered why someone would react in such a way, I'm not saying this is 100% why, but last night I found out that the guy in the unit above us is a sex offender and was convicted of sexual assault in the first degree, which isn't limited to minors but can involve them. I'm guessing that the landlord's unexcused outburst has something to do with this. As someone who was a victim of sexual abuse as a child, I'm terrified of my own, and I'm afraid that such stress levels will cause me to fall back into depression and/or possibly affect my unborn child. Had I known of this, I never would have moved into that place to begin with. I've spoken with a couple people since then trying to see if there's anything we can do about this and according to them the landlord is required to notify us of such things. Is this true, if so what actions can we take? Is this just cause to break a lease?

There is no national law which requires a LL to inform a tenant of known sexual predators (if he does, in fact, know of it himself). You would have to check local and state law for this info.

Your LL offered you an out. He said you could leave if you didn;t like living there. Why not take him up on it?