What is plead the 5th supposed to mean?

Privilege against self-incrimination

Explanation:

The Fifth Amendment to the U.S. Constitution guarantees that an individual cannot be compelled by the government to provide incriminating information about herself – the so-called “right to remain silent.”  When an individual “takes the Fifth,” she invokes that right and refuses to answer questions or provide information that might incriminate her.

Plead the 5th is basically pleading the 5th amendment which gives citizens the right to not answer any questions that might incriminate them in a court of law. This also means that authorities can't force you to give up info that might make you look suspect.

Hope this answered your question friend :)

a nurse can ask a member of congress to sponsor a bill that she/he finds important

answer:

they didn't want to get killed by the armed forces

explanation:

there was a lot of people there and some of the us armed forces had guns and they didn't want to die