no, the grand jury collects supposedly evidence against others, so the people now in jail got summoned to testify about other anarchists/activists, supposedly about their involvement in some broken windows of an federal courthouse during mayday (but that is a. secret, so we dont know for sure and b. the GJR said the questions where almost all about mapping the wider anarchist movement, not what happened on mayday).
the people summoned (and now in jail for refusing to testify/snitch) where offered immunity so they are not in jail because they want to not incriminate their selves, they are in jail because they refuse to co-operate with an political prosecution of others.
there are a bunch of articles that explain the grand jury system and how its a sneaky work around normal juridical procedure in layman terms in this thread; http://www.revleft.com/vb/grand-jury...164/index.html
The mind is its own place, and in itself Can make a Heaven of Hell, a Hell of Heaven. What matter where, if I be still the same, And what I should be, all but less than he Whom thunder hath made greater?
Here at least We shall be free