The limits of interest groups' use of extreme tactics might be gauged by the congressional Democratic backlash against the , which tried to block the North American Free Trade Agreement in 1993.

AFL-CIO: American Federation of Labor and Congress of Industrial Organizations

Explanation:

The American Federation of Labor and Congress of Industrial Organizations (AFL–CIO) is an interest group, considered to be the largest federation of unions in the United States. In 1993, AFL-CIO used extreme tactics to try and block the North American Free Trade Agreement in 1993. This their unpopular action resulted in a congressional Democratic backlash against the AFL - CIO.

Hence, it is concluded that, the limits of interest groups' use of extreme tactics might be gauged by the congressional Democratic backlash against the AFL - CIO, which tried to block the North American Free Trade Agreement in 1993.

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