The Maricopa Area Labor Federation and Arizona AFL-CIO recently voted to oppose Propositions 105 and 106. As they write here, both ballot initiatives represent a big-money attack on local labor:

Prop 105 would ban construction of new rail-based mass transit in Phoenix: killing light rail development entirely, hampering the expansion of union mass transit and construction jobs, and severely limiting the city's ability to provide new transportation option to workers.

Prop 106 purports to help public employees, but instead does the opposite - putting severe restrictions on new salary negotiations, and putting employee pension negotiations at a disadvantage. If passed, it could invalidate all labor contracts that have been negotiated since January 1, 2018.