Hoover believed that amicable business-labor relations were an important component of a prosperous economy. In 1931, Hoover signed the Davis-Bacon Act, which required a maximum eight-hour day on construction of public buildings, as well as the payment of at least the local 'prevailing wage.' The following year, he signed the Norris–La Guardia Act, which banned yellow-dog contracts, created a positive right of noninterference by employers against workers joining trade unions, and barred the federal courts from issuing injunctions against nonviolent labor disputes. Though Hoover had originally tried to stop the bill, he chose to sign it into law as he feared that Congress would simply override a veto.