They have the 1st amendment right to protest on public property, so your answer is yes. Even though they do have the right it seems as if they are not respecting the family of the fallen solider in their protest at the funeral.
It was indeed a legal protest
Nothing To Do LegallySince the Supreme Court ruled that they have a right to protest, there is nothing that can be done to them legally, at least not in the way we usually think of legally. We can; however, pray or light a candle, or whatever our personal spiritual beliefs lead us to do, if we believe the protests should stop. That wouldn't be doing anything bad to the protesters, is legal, and might stop the protests so the families could bury their dead in peace.
yes
Yes, the 1st amendment gives the freedom of speech which includes protest.
Picket, boycott, speech.
What are the legal steps to starting an independent church?
Yes and no. The 1st amendment gives citizens the right to freely and peaceably assemble. This means you are free to protest anything you would like. You can do so on public property, like the sidewalk, unless it creates some risk of safety.
no u idiot?
yes.
In the US, any public protest is legal, as long as you apply for the appropriate permits for lawful public assembly.
You, yourself can not. Join legalization groups, try to protest about it being illegal. It probably will not happen any time in this lifetime. Go to Amsterdam, it's legal.
Clergymen are men of the clergy, as in church men, and it's not a legal term.