There are a few ways to find out who is behind a private Instagram account. One way is to look at the account’s bio. If the account has been inactive for a while, it might be owned by someone who doesn’t want their name associated with it. Another way to find out is to check the account’s history. This will show you all of the posts and photos that have been made on the account. If you see any suspicious posts or photos, you can report it to Instagram by using their reporting tool.