Trojka

Dies anyone here know a series of books that was published about 25 years ago in Sweden? I'm not quite sure how many there were, but it could have been about 5 books together with grammars, instruction, excercise and solutions to the excercises. The printer was Esselte, and the author was Erik F

Do you mean this?
http://www.bokpris.com/author/Erik+F%E4lt

Nah, those look like russian grammar books, not books about communism... Except for the Trojka - da 1 and 2... are they the first two of the books you are looking for?