armed secret police stage hostile march on white house in uniform?

[John Mage]

So amazingly the secret police were "Clad in dark overcoats and sporting
sunglasses" - is this to demonstrate and be unrecognizable at the same
time?  unrecognizable by whom? how do we know that they were *really*
secret police? or is this their uniform, taken from movies or Colorado
High Schools?

Would someone with a working TV who catches this strange sight describe
it for me?

john mage 

Friday, 15 December, 2000, 21:04 GMT 

           Men in Black hold

           silent protest

           Several hundred agents of the United States

           Federal Bureau of Investigation, the FBI, have

           held an precedented protest march around the

           White House in Washington. 

           They were demonstrating against a

           controversial pardon under consideration by

           president Clinton for a man Leonard Peltier

           convicted of killing two FBI agents in 1975. 

           Clad in dark overcoats and sporting

           sunglasses, the FBI agents marched in silence

           two-by-two behind a banner reading "Never

           Forget", in reference to their dead colleagues. 

           The FBI protestors tried to hand in a petition,

           but were told by secret service agents at the

           White House that they could not do so for

           security reasons. 

           From the newsroom of the BBC World

           Service