Other forms: janissaries
A janissary is a devoted follower or steadfast ally. The people chanting supportively and waving signs at political rallies are usually the candidate's janissaries.
Today's janissary is a hardcore supporter, someone whose priorities and opinions align with a particular person or group. The original meaning of the word, also spelled janizary or janisary, was "elite Turkish soldier," from a root that means "new troops." The earliest janissaries, in the 13th century, were mostly composed of war prisoners or slaves — rather than being devoted to a cause, they were forced to support it.