Of course there are prosecutions of violations of labeling laws.

November 9, 2011
Oregon Pesticide Vendors Violated Laws Aimed at Protecting Consumers from Mishandling Products
Three Oregon companies violated federal pesticide laws designed to protect consumers, according to three separate settlements with EPA. [They] will pay $127,000 for selling mislabeled pesticide products in Oregon. "When pesticides aren't handled properly they can make people sick and harm the environment," said Scott Downey, Manager of EPA’s Pesticide Unit in Seattle. "Companies must label products correctly and according to the law so people can use them safely."

October 11, 2011
Massachusetts and Japanese Companies Settle with EPA for Pesticide Violations
A Wakefield, Mass. company and a company from Nagoya, Japan have agreed to pay a total of $220,000 to settle claims by the US Environmental Protection Agency that they imported, distributed and sold silver-ion based antimicrobial pesticide products in violation of federal pesticide requirements.

July 12, 2011
Oregon Pesticide Company Agrees To Pay $54,000 for Using Outdated Labeling on Pesticide Products
EPA reached a $54,080 settlement with Orcal, Inc., for numerous violations of the Federal Insecticide, Fungicide, and Rodenticide Act (FIFRA). The outdated labeling included directions for use that did not match EPA accepted statements. On at least 52 separate occasions in 2008-2009, Orcal sold, and distributed Orcal Slug & Snail Bait and Southern Ag Snail & Slug Bait with incorrect labeling.

Just a few examples from http://www.epa.gov/agriculture/lfraenf.html

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