The U.S. deported hundreds of immigrants after President Donald Trump invoked the Alien Enemies Act for the first time since World War II.

The president’s invocation of the wartime law enacted in 1798 was quickly blocked by a federal judge. It had only been used three times before in U.S. history.

In a 226-year span, the Alien Enemies Act of 1798 had been invoked only three times — until now. President Donald Trump fulfilled a campaign promise to use the wartime act as a shortcut to deport suspected members of a Venezuelan gang, according to an executive order signed March 15.