Which of these actions would be an unconstitutional violation of rights?

a. The police arrest a group of civil rights activists who have committed an act of civil disobedience.
b. The local authorities refuse to issue a parade permit to a group who wants to march past a school during school hours.
c. The police arrest a man for giving a speech that urges the violent overthrow of the government.
d. The authorities refuse to give a demonstration permit to a group that wants to hold a rally promoting racist beliefs

c. The police arresting a man for giving a speech that urges the violent overthrow of the government would be an unconstitutional violation of free speech rights protected by the First Amendment.

In order to determine which of these actions would be an unconstitutional violation of rights, we need to consider the fundamental rights protected by the Constitution.

a. The police arresting a group of civil rights activists who have committed an act of civil disobedience would likely not be an unconstitutional violation of rights, as long as the arrest is done in accordance with the law, with due process, and respects the rights of individuals.

b. The local authorities refusing to issue a parade permit to a group who wants to march past a school during school hours may not necessarily be considered an unconstitutional violation of rights. Local authorities have the ability to impose reasonable time, place, and manner restrictions on the exercise of free speech rights, especially in situations involving school safety and disruption.

c. The police arresting a man for giving a speech that urges the violent overthrow of the government could potentially be considered an unconstitutional violation of rights. Under the First Amendment, individuals have the right to express their political views, even if they are unpopular, as long as the speech does not incite immediate violence or pose a clear and present danger.

d. The authorities refusing to give a demonstration permit to a group that wants to hold a rally promoting racist beliefs may also not necessarily be a violation of constitutional rights. While the First Amendment protects the freedom of speech, there are limitations when it comes to hate speech or speech that directly incites violence or poses a threat to public safety. The denial of a permit in this situation may be justified based on these concerns.

Ultimately, the determination of whether these actions are unconstitutional would depend on the specific circumstances, legal context, and balancing of individual rights versus legitimate government interests. It is important to note that legal opinions may vary on these matters, and consulting with a legal professional would provide more context-specific guidance.