In winter 1980 , Bergmann and his co-workes formed the Committee of Charter 77 .
In the period 1979 to 1980 he was a co-editor of Dialogue : a Cultural and Political Review , published in a samizdat .
In winter 1980 , co-editor and co-editor 's co-workes formed the Committee of Charter 77 .
In the period 1979 to 1980 he was a co-editor of Dialogue : a Cultural and Political Review , published in a samizdat .