Wiktionary
n. (context idiomatic US chiefly colloquial English) Authorization that is extremely (l en difficult) to get, especially in a timely fashion.
Wikipedia
An Act of Congress is a statute enacted by the United States Congress. It can either be a Public Law, relating to the general public, or a Private Law, relating to specific institutions or individuals.
The term can be used in other countries with a legislature named " Congress," such as the Congress of the Philippines.
Act of Congress is a Birmingham, Alabama based singer-songwriter group. They play only acoustic instruments in their music, giving them a sound that is unique, meshing several genres of music together. Their first performance of the debut album Declaration sold out at WorkPlay Theater in Birmingham in 2008.