I think it is somewhere in the Communist Manifesto. I'm not sure if he says it so straight up but he says something like that. If you find it in any of his books, a chapter/page number would be appreciated. Thanks!
radish
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http://www.marxists.org/archive/marx/works/1848/communist-manifesto/ch02.htm
there's a brief (one liner) here
(from Marx & Engels: Library: 1848: Manifesto of the Communist Party: Chapter 2: )
"The proletariat will use its political supremacy to wrest, by degree, all capital from the bourgeoisie, ... .. ... ..
... ... ...These measures will, of course, be different in different countries. "
nb Nevertheless this last line is then followed by a number of processes which would have to be followed in every situation