The Muslim Brotherhood celebrated its 90th anniversary in Turkey on Sunday, in a ceremony titled “90 Years of Giving,” the Middle East Monitor reported.

Dozens of the group’s leaders attended the ceremony from around the world, including the group’s deputy Supreme Guide, Ibrahim Munir, along with thousands of their members.

The Muslim Brotherhood is a Sunni Islamist group with political and social movements. It was established in March 1928, in Egypt.

Many Arab regimes, including Saudi Arabia, the United Arab Emirates and Egypt, have listed the Brotherhood as a “terrorist group.”

Following Egypt’s 2011 revolution, the Muslim Brotherhood was one of the most powerful groups to run for Egypt’s Presidential elections, which saw Mohamed Morsi serve as the country’s fifth president. A year later, he was ousted by the army.

In Jordan, the group was licensed in 1946 as a charity affiliated with the mother group in Egypt, and was relicensed in 1953 as an Islamic society.