The union surveyed 965 players last fall and reported that 85.1 percent of them preferred grass to artificial turf.
The union reported, however, that 19 percent of the 36,685 workers who cast their ballots still opposed the new contract.
The union reported opting to preserve jobs over getting raises.
Corporations and unions reported spending $2.2 million to back certain candidates.
During the seventies unions were reporting record membership.
The national teachers' union reported that more than 300 of its members received death threats in 1987 and that 15 were murdered, Amnesty International said.
Reversing years of decline, some unions reported increased membership in recent months.
Only two years ago, the union reported cash of $973,519.
The 240 workers covered by the agreement will receive wage increases totaling 9 percent over the next three years, the union reported.
In October 2010 the union reported to its members that it had settled with the university.