Final answer:
Privatization and downsizing of public-sector jobs have negatively impacted the growth of public-sector unionization by reducing the number of jobs available to unionize in the public sector.
Step-by-step explanation:
The question addresses the factors that have not contributed to the growth of public-sector unionization. Among the listed options, privatization and downsizing of public-sector jobs has not contributed to the growth of public-sector unionization but rather has a negative impact. Such downsizing often involves the transfer of jobs from the public sector to the private sector, which reduces the number of jobs that could be unionized within the public sphere, diminishing the potential for public-sector union growth.
Historically, strong public-sector labor laws, the successful establishment of impasse procedures to resolve labor disputes, and a somewhat favorable public attitude have generally contributed positively to the growth of public-sector unions. Additionally, the effective campaigning to fund negotiated labor agreements has helped to reduce the cost to management of agreeing with the union, further aiding union growth.
However, other elements such as workplace protection laws have, ironically, made some workers feel less of a need for unions, as these laws provide safeguards that unions traditionally fought for. Moreover, the shift in the nature of jobs from manufacturing to service industries, where unions have been less successful in organizing, may also explain a decline in union membership outside the public sector.