Causes of Citizenship Loss
U.S. citizens are subject to loss of citizenship if they perform certain acts voluntarily and with the intention to relinquish U.S. citizenship. These acts include:
1. Obtaining naturalization in a foreign state;
2. Taking an oath, affirmation or other formal declaration to a foreign state or its political subdivisions;
3. Entering or serving in the armed forces of a foreign state engaged in hostilities against the U.S. or serving as a commissioned or non-commissioned officer in the armed forces of a foreign state;
4. Accepting employment with a foreign government if (a) one has the nationality of that foreign state or (b) a declaration of allegiance is required in accepting the position;
5. Formally renouncing U.S. citizenship before a U.S. consular officer outside the United States;
6. Formally renouncing U.S. citizenship within the U.S. (but only “in time of war”);
7. Conviction for an act of treason.
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http://hamilton.usconsulate.gov/loss_of_citizenship.html
“are subject to loss”
Yes, and this is another instance where the U.S. Supreme Court has effectively nullified the enforcement of those laws in the aforementioned case law.