More than half of adult Americans think that labor unions are too disruptive and make it harder for U.S. businesses to compete in the global marketplace. Among union households, 26% felt unions were too disruptive. The responses were part of a telephone poll conducted this summer by opinion research firm Wirthlin Worldwide. The pole also found that 62% of those over 55 also felt unions were too disruptive, compared with 49% of those under 55. Nearly half of those surveyed (48%) felt the union's role in protecting workers is less important today than in the past, and 26% of those in union households agreed. What's more, only 27% of those polled feel that union workers are trained and do a better job than non-union workers.