Members of Iran’s Islamic Revolutionary Guard Corps march in a parade in Tehran, Sept. 22, 2011. Photo: Reuters / Stringer / File.

The United States officially designated Iran‘s elite Islamic Revolutionary Guard Corps as a foreign terrorist organization, according to a notice published in the US Federal Register on Monday.

US President Donald Trump said last week he would make the symbolic but unprecedented move, which immediately was condemned by Iran and created concerns about reprisal attacks on US forces.

The IRGC is in charge of Iran‘s ballistic missile and nuclear programs. It also is involved with the country’s banking and shipping industries. The new designation makes it easier to prosecute companies or people in the European Union that do business with Iran.

American law already punishes US persons who deal with the IRGC with up to 20 years in prison because of the group’s designation under the US Specially Designated Global Terrorist list, a different US sanctions program.