What is "picketers"

Usage examples of "picketers".

We know already there will be armed guards, and the picketers could get belligerent.

One woman told me it cost two bucks to get your husband out, and another said that every day the police arrested so many picketers they had to hire trucks from other towns.

The picketers who had been in the fight did not return, and no replacements were sent.