UK, Ireland /
Why do so many Polish guys in the UK have a crew cut or buzz cut? [106]
Short hair implies order,following rules,not being afraid to show your characteristics etc.It is the prefered look among all radical right organizations.Long hair implies revolution,disobedience etc and it is the preferred look among radical left and anarchists.In fact if you try to appear in short haircut in an anarchist neighbourhood it is likely you will get attacked and the same happens when neonazis meet long haired individuals.Haircut acts as a provocation because it shows fearlessness to show one's political attitudes in extreme way.
Chetnics are an exception because due to local Balcan tradition they regarded themselves as revolutionaries and carried beards despite heavy conservatism.Also they wanted to hide their facial characteristics due to the nature of their actions,they wanted to scare the enemies by long beards meaning we really do not care what will happen with you or we are not afraid to show we are chetnics and they wanted probably to show the connection to orthodoxy and local priests who also carry long beards.The bearded,long haired revolutionist who spreads terror in Balkans usually riding a horse appearing where nobody expects him hiding in the day and clearing his enemies with silent ways(knives,pieces of tan cans on throat etc) is quite common.
en.wikipedia.org/wiki/Aris_Velouchiotis
An example of a famous and controversial Greek revolutionist who took lots of lives down with him.