There were a lot of music clubs around England in those days. Some clubs were owned by Jamaicans that played reggae and soul music. Oi music had racial lyrics and made skinheads become really violent. The British National Party, a neo-nazi group, started to back the bands and exploiting them to recruit new members. This is when the group became a hate group.
Skinheads are now all over the world.
They appeared in America in the early to mid 1980's. They commit more hate crimes than any other group. The average skinhead is between 12-25 years old. The reason for recruiting young men is that they are easily persuaded, and were more likely do as they were told. Most of the recruits come from broken homes.