We have discussed this on this forum a few times over the years. I was an avid listener to all the socialist stations, and always looked forward to the books, magazines, records, pennants, etc.
Radio Berlin International was my favourate, and I even went to visit the station as a teenager. Loads more info about it, and a few Where Are They Now? snippets about the presenters onhttp://radioberlininternational.blog.co.uk/
Many of the Soviet republics also had their own English language stations. I remember Radio Vilnius, Radio Kiev, and Radio Tashkent.
At the age of 14, in the 70s, I wrote to Radio Hanoi - The Voice of Vietnam voluteering to join them in the fight. I got a reply back thanking me, and suggesting that campaigning for peace at home would be a much better idea.-JP