The Order of Terra is a religious organization founded on Earth which protests galactic expansion.
Thought they mainly staged protests on Earth, they had also committed acts of terrorism against the Terran Federation and its allies. On Mars, the colony of Mars Dome One was bombed by a cell of the Order. In 2097, the Danteri Embassy was bombed by the leader of the order, who was arrested and sent to the Alcatraz Stasis Prison a few days later.
By the 26th century, the Order of Terra still existed and had groups in the Outer Colonies.