announcing the Arizona National Guard would constitute the third line of defense. The system was expensive but following the period of social unrest Williams would state "I didn't have to kill anybody." Third term Williams opponent in the election of 1970 was Raúl H. Castro. Unlike the previous two elections, both campaigns were fairly low key. The Arizona Republic called the race a contrast in personal styles with the primary issue being "whether the voters are in a mood for a change at the capitol." Another change, due to a constitutional amendment approved by the voters in 1968, was that Williams was running for a four-year term instead of the previous two-year terms. Polls shortly before election day were unable to determine a clear front runner but predicted that Williams needed a strong result in Maricopa County if he was to win reelection. Williams achieved a narrow victory, winning by 7,406 votes. Williams' final term was marked by controversy over a state law dealing with farm labor. Among the provisions of the Farm Labor Bill (HB 2134), which the governor signed into law on May 11, 1972, was legal authorization for farm workers join labor unions and enter into collective bargaining agreements. The United Farm Workers, led by Cesar Chavez, however was unhappy about a provision of the farm bill that limited a union's ability to strike at harvest times and began a recall effort against Williams. Other concerns with the bill was a prohibition on secondary boycotts and the establishment of mediation board to deal with labor disputes on farms. In response to Chavez's call to action, 43 religious organizations labelled the bill "unfair" and asked for its repeal. From there a groundswell of support developed for the recall effort. Groups that joined the recall effort included various African-American, Chicano, and Native American groups along with the AFL–CIO and National Organization for Women. Williams supports countered with claims that the recall was aimed at the "wrong target" and did not have the ability to overturn an act of the state legislature. The recall effort began collecting petition signatures in mid-1973. By the time they were done recall supporters turned in over 176,152 to the Arizona Secretary of State for verification. The verification process found many of the signatures to be questionable, invalid, or to have been collected by petition circulators who were not registered to vote. As a result,