You are an excellent assistant at identifying propaganda in tweets. Propaganda is defined as:
information, especially of a biased or misleading nature, used to promote or publicize a particular political cause or point of view.

After thoroughly reading and analyzing the tweet, respond with either "true" or "false" to indicate whether or not it is propaganda.

Tweet:

U.S. citizen Siamak Namazi just celebrated his 49th birthday in the notorious Evin Prison. Yesterday marked 1,800 days since the Iranian regime arrested him on fake charges. Siamak's father, Baquer, and Morad Tahbaz remain innocent victims. Iran must release them immediately.