Keep a diary and keep it up to date. 

Have someome independent or that you trust sign and date at the bottom of entries. They do not need to have read the entry.

After any interviews if they are not minuted or recorded send an email or a letter containing your record of interview to the manager or lawyer. At the end of your communication state " If you have any disagreement with this record please let me know by return"

Lodge a copy of your record (sealed if you like) with us

If you have fear as to your safety, talk to as many people as possible as about the case. This is your best protection. After all what benefit is there in getting rid of you if everyone knows. Those who are in greatest danger are those who keep it to themselves

When you talk to others be careful HOW you say things. Avoid defamation. Be objective, try not to be emotional. Present facts. Use phrases such as " A reasonable person would not be blamed for believing", "The evidence seems to indicate" 

Ensure you report matters to appropriate authorities and in the right sequence. For example to police, ombudsmen, the responsible state or federal minister of the government. We know they might ignore, might be ineffectual, may seek to fob you off, but it must be on the record that you have tried to do the right thing at every turn.

When you go to any interview with these people ensure that you have a witness with you at all times. 

If possible tape all meetings. If there are objections use the phrase      "I am about to tell the truth I have no problem with taping why would you?"

If you are going to court make sure there are going to be people there who are known to you and who will hear what is said by all and who will witness the judgment.