You don't have to be convicted in order for the feds to step in. There is no rule that says civil rights violations can only be investigated by the DOJ when the subject of the violations has been convicted of a crime. Violations of civil rights perpetrated under color of authority take place when government authority is abused in such a way that an individual's constitutional right(s) have been abridged.
There is also nothing that requires such violations only take place in the form of cops beating somebody beyond necessary force.
From the Civil Rights Jusridiction section:
728 28 U.S.C. § 1343(3). The cause of action to which this jurisdictional grant applies is 42 U.S.C. § 1983, making liable and subject to other redress any person who, acting under color of state law, deprives any person of any rights, privileges, or immunities secured by the Constitution and laws of the United States. For discussion of the history and development of these two statutes, see Monroe v. Pape, 365 U.S. 167 (1961); Lynch v. Household Finance Corp., 405 U.S. 538 (1972); Monell v. New York City Dep’t of Social Services, 436 U.S. 658 (1978), Chapman v. Houston Welfare Rights Org., 441 U.S. 600 (1979); Maine v. Thiboutot, 448 U.S. 1 (1980). Although the two statutes originally had the same wording in respect to “the Constitution and laws of the United States,” when the substantive and jurisdictional aspects were separated and codified, § 1983 retained the all-inclusive “laws” provision, while § 1343(3) read “any Act of Congress providing for equal rights.” The Court has interpreted the language of the two statutes literally, so that while claims under laws of the United States need not relate to equal rights but may encompass welfare and regulatory laws, Maine v. Thiboutot; but see Middlesex County Sewerage Auth. v. National Sea Clammers Assn., 453 U.S. 1 (1981), such suits if they do not spring from an act providing for equal rights may not be brought under § 1343(3). Chapman v. Houston Welfare Rights Org., supra. This was important when there was a jurisdictional amount provision in the federal question statute, but is of little significance today.
I added the bold. Seems to me that's the important bit, but I'm no lawyer :)
I wonder if the team could get class action status?