Thomas University and to advocate the position of the organization before the Universitys administration, municipal government, provincial ministries and federal departments. The Students Union strives to enhance the life and experience of students with a positive educational, social and. Thomas University. About the St. Thomas University Students' Union. Established over 75 years ago, the St. Thomas University Students Union is a democratic body representing all students at St. Thomas University. The mission of the Students Union is to effectively represent.