Yes.
Jews did not agree to be police in the ghettos, they were made to!
Some of them were!
One of the definitions for the word covenant is "agree, especially by lease, deed, or other legal contract."
The Jews were taken to extermination camps by force. They did not 'agree' to go voluntarily.
Jews believe in a single, indivisible God-creator, who had chosen the People of Israel to be its instrument upon the Earth (note that a "chosen" people does not necessarily mean "better" than anyone else), and formed a Covenant with them in exchange for their worship. It's catechism is "Hear, O Israel: the Lord is your God, the Lord is One". There are different strains of Judaism as with every major faith, but this is the basic tenets that probably everyone will agree upon.
Abraham, the patriarch of the Jewish faith. God made a Covenant with Abraham.
The second covenant was the one that God gave at Mount Sinai, which reinforced the covenant that God had given to Abraham, and told the Jews what they would have to do as their side of the covenant. God again promised to stay with the Jews and never to abandon them, because they were his chosen people. (see the related link)
A covenant literally means a promise or pact, in the case of the jews, G-d made a covenant with Abraham about his descendants and what they would inherit and become
It is God's covenant and its mitzvoth (commands) are binding upon Jews.
Because the co-signer was God himself.
Because of our covenant with Him (Exodus ch.19).
It is the covenant with God as expressed through the Torah.