Note: The DearEsq free 'ask a lawyer' site is offered as a free informational service to the public and is not intended as legal advice. Laws vary from state-to-state, and in addition every situation is unique, and relevant facts may not be known. The answer to the question posed below may not apply to in your state or to your situation. For legal advice in your state and your situation you should consult with an attorney in your state who is familiar with the rules and laws in your state.
“Is it illegal for my neighbor to monitor what I do on my internet? I have a wpa2 security protocol and I keep changing my password but they keep getting on somehow. If it is illegal can I go to the police? I am living in the state of NY.”
Yes, it is almost certainly illegal, under several different theories, including trespass, and invasion of privacy, and quite possibly Federal wire laws. And yes, you should start with your local police department, but be prepared to bring hard evidence to file with your report. If you have such hard evidence, you should also call the local office of the FBI and ask them for their advice on how to prosecute the matter.