Which of the following was not one of the functions of the freedmen’s bureau?
collecting taxes
reuniting families
establishing schools
workers secure labor contracts

   Collecting taxes

Explanation:  The primary purpose of Freedmen's Bureau was to provide assistance to former slaves-Afro Americans, and poor whites in the south after the Civil War. This bureau was founded in 1865 by the Congress, and helped former slaves to find job, receive medical help, legal assistance, education, as well as the legal regulation of the settlement of former slaves to lands that were abandoned during the war or confiscated, and most importantly equal treatment in society. This task was not at all easy given that racist ideas remained after the war, and those who opposed the abolition of slavery sabotaged the implementation of new relationships in all possible ways, and the inclusion of former slaves. The Bureau was active during the so-called Reconstruction period after the Civil War from 1865 to 1872.

so, based on the research i've done. the u.s. government were always on a wild goose chase just to take down castro. he then retired his trone to his brother raul in 2008 due to some health issues. so it's obvious your answer would be:

castro had no allies from which he could receive aid.

hope this and have a fantastic day!

                                                    -wolfiewolffromsketch