Prison no Tuperware party

While I agree with your editorial about media culpability in sensationalizing certain crimes, I have a question.

How would the other inmates know who the new inmate is, or what crime he is charged with? That information could only come from the guards at the prison.

I don't believe that going to prison is like a Tupperware party where each arrival is introduced around and gets to share a little bit about themselves! Only the guards know the crime alleged, and only they could be "passing the word".