The power to prohibit an act from becoming a law is called "veto power." Typically exercised by an executive authority, such as a president or governor, this power allows them to reject legislation passed by the legislative body. The vetoed legislation may still become law if the legislature overrides the veto, usually requiring a supermajority vote.
Federal Employees Political Activities Act
The Taft Hartley Act did prohibit the jurisdictional strikes.
illegal taxation
The Sherman Antitrust Act was passed by Congress in 1890 to prohibit monopolies and trusts, and to promote fair competition in business.
virtually all exports and most imports
That is called secession. It refers to the act of withdrawing from a political entity such as a country and becoming independent.
In the USA, there are several Acts like that, including the Sherman Act, categorized under "anti-trust". In other countries it may be called "anti-competition law".
hellllllllllllllllllllll no
Alien Act
the embargo act forbade Americans to export or import goods
Yes.
America would prohibit all foreign trade.