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5 Mergers That Failed

Tickers in this article: AMZN CMCSA DISH DTEGY DTV GE HON ODP SPLS T TWC WMT

NEW YORK (TheStreet) -- Merger deals that go before the Department of Justice's anti-trust division, the Federal Trade Commission and when applicable, the Federal Communications Commission, are almost always confirmed.

That's because companies are reluctant to put forth a transaction the government might reject. There's just too much time and money involved in executing a merger or acquisition to go through a lengthy and costly approval process only to see it fail.

But some deals are rejected as regulators determine that the combined company would deter competition thereby harming consumers or an entire market of buyers and sellers.

Here are five transactions that should serve as a warning sign to Comcast  and AT&T as they lobby, cajole and pressure government regulators to approve their acquisitions of Time Warner Cable  and DirecTV , respectively.

Government regulators, the spotlight is on you.