It is Illegal to withhold information of a crime if it has not been formally reported yet?

Several individuals with authoritative power within an institution that I know of have intentionally hidden the details and whereabouts of 3 lesser individuals who have committed a second-degree misdemeanor. Whilst talking to people within the community surrounding the incident, I discovered that the authorities kept this from their superiors only to protect the reputation of their department. I have personally discussed with and confronted several people who were indirectly related to the crime but had prior and extensive knowledge of the information entailing the incident. Using this information, I have compiled a report to send to the police and the superiors of the authorities in question. I do know the individuals aforementioned personally and know that this report could cost them their jobs. I need to know which Federal Laws or State Laws/Statutes (Florida) could they have broken by withholding information and the potential consequences to them and also the lesser individuals