Oh please be specific. I’m continually amazed by what people think they know about Cruz. You are suffering from demoncrapitis Mr. Fish, i.e., you are very sure about things that have no basis in fact.
Since you asked, here's proof (PDF, 10 pages) that Senator Cruz has committed acts of Treason. The proof is not mere assertion, but sourced and referenced, all with information that is both public and easily available.