If you are with a group protesting in DC and your numbers are 24 or less, you do not need a permit. If you have the magic "25" or more, you do need a permit and can be subject to expulsion or arrest if circumstances are such that they are enforcing the rules to the letter.
For the majority of our protests outside the White House, or elsewhere in DC for that matter, I arrange for permits to cover people showing up and joining us.
We have such a permit for this coming Tuesday evening. Hillary is having another fundraiser, this time for the Democratic Senatorial Campaign Committee. We will be out in force at the corner of Massachusetts Avenue and Whitehaven Street, N.W. to give all Hillary's guests a FReeper welcome. We'll have a real good time!