My job is telling me that i am on administrative leave without pay because i was arrested for something and have not been convicted yet.

Generally speaking, employment in the United States is on an "at will" basis. That means that the employer may terminate or suspend employment at any time for any reason or no reason at all. The courts generally do not engage in a judicial inquiry into whether the employer's decision was a good one or a bad one, as long as the employer does not engage in prohibited discrimination (such as on the basis of race, religion or national origin).