Source: Adrienne E. Eaton and Jill Kriesky, Industrial and Labor Relations Review, Vol. 62 No. 2, January 2009
From the abstract:
The authors evaluate policy arguments for and against the use of card check as a method to determine union recognition. The results of an analysis of data from telephone surveys of 430 workers who had been through the NLRB election or card check campaigns of six unions in 2003 indicate that there was little undue union pressure to support unionization in card check campaigns, and that management pressure on workers to oppose unionization was considerably greater than pressure from co-workers or organizers to support the union in both card checks and elections. The authors also find that although workers in card checks do appear to have had somewhat less information about unions and about the recognition process than workers in elections, workers who felt they had insufficient information to make a decision about unionization tended not to sign cards.