In the incident, which was caught on camera in Aberystwyth, Ceredigion, a man was treated for non-life threatening injuries.
Judge Huw Rees called it “disgraceful,” and an eyewitness described it as “madness.”
The trio was ordered to perform 150 hours of unpaid labour.
Richard Allen, 31, of Sheldon, Birmingham, was sentenced to 22 months in prison, suspended for 12 months, after admitting affray, criminal damage to a police cell, and breaching bail in October 2019.
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After admitting affray, Darren Dragoonis, 35, of Birmingham, was sentenced to 16 months in prison, suspended for 12 months.
After pleading guilty to affray and being in possession of a Class B drug, Jack Smith, 27, of Solihull, West Midlands, received a 16-month prison sentence suspended for 12 months.