In the bad old days of the 1980s, "ultras" were the members of Italian political/soccer hooligan gangs.
I seem to remember that Lazio was the fascist Roman club and AC Roma was the Communist one. The AC bunch were known as the "Yellow Red Brigade", after the colour of their team.
Wouldn't be surprised if the same coinage had spread to Mexico via. the Spanish footie fans.
dd
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