From its inception in 1972, the union had been involved with the Union of Students in Ireland (USI). ULSU withdrew in 1991 from USI after it decided that the national union was no longer doing what it should be doing for ordinary students on the ground. ULSU has never reaffiliated to USI, although an inquorate referendum held in 2001 on the issue indicated some support among students for such a move. The votes cast in this referendum were counted and showed that just under 55 percent of students who voted were in favour of rejoining. 66 percent in favour would have been needed to pass the referendum. The referendum did not have enough votes (only 700, changed from 20 percent to 15 percent in 2006 to be deemed valid).