Several federal agencies handle consumer complaints relative to their particular area of authority. You would have to be more specific about WHAT type of complaint about WHAT product or service.
Many, many retail outlets in the US that draw consumer complaints, and questions.
The US cabinet agency that enforces the laws of the federal government is the Department of Justice (DOJ). The agency is responsible safety of the public from foreign and domestic threats.
First, find out if there is a process to register guns where you are. There is no gun registration in most of the US. If registration IS required, then check with the agency that handles that.
In the US, it is the Department of Agriculture. The Farm Services Agency specifically handles erosion control policy in conjunction with the Natural Resources Conservation Service.
United States Department of Commerce is the US Government department that handles trademarks.
The official propaganda agency of the US does not exist. The US government does not have a designated agency for propaganda.
The United States Department of State handles foreign affairs.
(in the US) It is usually conducted under the authority of the Consumer Product Safety Commission at the intiation of whichever Agency that requested the recall notice.
The DEA handles the drugs around the US
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If you are outside the US you file a petition with the US Embassy for the country where you currently live. The US State Department has some information on non-immigrant US visas. USCIS is the agency that handles the actual visa processing. The US Embassy in your country will have the most detailed descriptions of the non-immigrant visas and how to obtain them on the Embassy website.
A mullet us a fish and is a consumer.