Several journalists have been jailed - just for doing their jobs. You can read the vivid account of the experience of Ryan Deveraux a reporter for The Intercept. There is also a page that is keeping track of journalists arrested in Ferguson.
Marcy Wheeler has written a great article on the op-ed article of Attorney Gen. Holder.
In the comments in the Intercept article you'll see I posted a poem:
Unfolding, streaming before the nation, the world
The choking fog of tear gas
revealing the shamelessness of arrogance
The blaring shrieks of sound canons
seeking to drown the voices raised in indignation
The sobering display of armored force prowling the streets
mocking such ideals as free assembly and free press
The continuing disrespect shown
by those who are supposed to protect and serve (not profile)
The burning wound of a mother’s anguish
which cannot so easily be anesthetized
It stays raw, demanding our attention