Bronfenbrenner is also well known for her studies of anti-union tactics utilized by employers in NLRB-sponsored union organizing elections. In 1995, Bronfenbrenner and Juravich co-wrote 'The Impact of Employer Opposition on Union Certification Win Rates: A Private/Public Sector Comparison.' Previously, individual labor unions—and, to a lesser extent, the AFL-CIO—had collected anecdotal evidence on employer anti-union tactics and strategies. Much of this work was kept secret, for fear that anti-union employers would realize that unions were learning how to respond and modify and improve their anti-union tactics accordingly. This 1995 paper, however, brought this research agenda into the open and made it a topic for academic discussion. The paper grouped and categorized anti-union tactics and strategies, and used surveys and statistical analysis to judge their effectiveness. This paper also had a galvanizing effect on the American labor movement, creating a behind-the-scenes cottage industry in analyzing anti-union consultants and anti-union organizing campaign tactics. The work of the AFL-CIO-affiliated organization, American Rights at Work, and its opposite number, the employer-financed Center for Union Facts, both stem from the emphasis on opposition research engendered by Bronfenbrenner's paper. Data cited in the paper was heavily relied on by proponents of the Employee Free Choice Act (EFCA). EFCA opponents dispute much of her statistical assertions, claiming that they are derived from uncorroborated reports of biased union organizers.