The Arizona Prohibit Union Membership for Employment Act, also known as Proposition 4, was on the November 2, 1948 ballot in Arizona as a veto referendum, where it was approved, thus upholding the legislation. The measure prohibited the denial of employment due to non-membership in a labor union.
| Arizona Proposition 4 (1948)|
| Yes|| 86,866|| 59.03%|
Election results via: Arizona State Library
Text of measure
The text of the measure can be found here.