:: See Wikipedia:Summary_style. While this part of Wikipedia:Manual_of_Style does not exlicitly ban summaries at the begining of sections, it provides important guidience on how such articles should be structured. In other words a section should act as a summary of a subarticle. In the present article sections do sum up relevant subarticles, but there are additional summaries of sections themself and finaly the lead section. If you think that the sections are too long and need summaries, it means that article/subarticles are unbalanced. In this case you should shorten the long sections (which are summaries themself) and remove section's summaries. 
 :: In addition, I have mentioned that "Subtitle C ..." section does not have a summary, which also proves that the article is unbalanced, because sections "Subtitle B ..." and "Subtitle A ..." are given more weight then "Subtitle C ...". 
 :: I actually found these summaries while reading "Subtitle B ...". I read "The subtitle allows the Board of Governors of the Federal Reserve System to authorise personnel to act as law enforcement officers to protect the premises, grounds, property and personnel of any U.S. " in the summary then read the same in the relevant subsection. I initially thought that I found a simple duplication, which often exist in WiKi articles. This actually forced me to interrupt reading and go up the article to check my discovery. I think such duplication can confuse and irritate readers, like it irritated me. At least these summaries must not repeat phrases from the subsections, i.e. they should be summaries not duplications. 
 :: As to references, I am more concerned with a lack consistency: "Restrictions on accounts and foreign banks" subsection does not have refs, but the next subsection has lots of them. I hope that my observation will be helpful.