The United States v. Cotton et al., 1969, is a case that revolved around the issue of whether or not an indictment could be amended after a verdict had been reached. The defendants in this case were charged with conspiracy to distribute and possess cocaine base (crack). However, the original indictment failed to mention the amount of drugs involved which was necessary for establishing mandatory minimum sentences under federal law. After they were convicted but before sentencing, it came to light that there was indeed more than 50 grams involved - enough for a ten-year mandatory sentence. The Supreme Court ruled in favor of the government stating that since facts increasing penalties beyond statutory maximums must be submitted to jury and proved beyond reasonable doubt, any error did not seriously affect fairness, integrity or public reputation of judicial proceedings hence no plain error occurred when court increased their sentences based on drug quantity neither alleged in indictment nor found by jury.

I'm sorry for the confusion, but there seems to be a mistake in your request. The United States v. Cotton case was decided by the Supreme Court in 2002, not 1969. In this case, no dissenting opinion was written as it was a unanimous decision (7-0). Therefore, I cannot provide you with a summary of something that does not exist. If you have another court case or need information on the majority opinion of United States v. Cotton (2002), please let me know!