Definition of "Redshirt"

Like the leaders they opposed, they had participated in the "Redshirt" campaign of 1876 and 1877 that redeemed the state for home rule and founded the new establishment.

1986, Joel Williamson, A Rage for Order

Families and supporters of the Redshirt protesters in Thailand handed in a letter to the London embassy yesterday calling for an end to the killings and suppression of pro-democracy campaigners.

2011, A Year on The Sauce, page 19

In this process, known as the Risorgimento, Garibaldi led his Redshirt followers to decisive victories over the Spanish Bourbon and Austrian Habsburg dynasties that still ruled much of Italy.

2013, Simon Sebag Montefiore, Istanbul, Rome and Jerusalem: Titans of the Holy Cities