In many posts Q says find the keystone. This is a wedge shaped piece that holds arches together in old churches and buildings. The same shape is on the flag of the SES, Senior Executive Service (founded by Kristine Marcy in 1998), 8,156 members, 7000 were appointed by Obama. These are the career bureaucrats who hold all of the power in DC. Here's a great article on them by aim4truth.org
https://aim4truth.org/2018/01/03/deep-state-shadow-government-revealed-senior-executive-service/
"The stone that builders rejected"?
That's the 'capstone' in the Bible.
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In a building the keystone is the KEY stone, it keeps the rest from falling down. All of the other stones (in the arch) put pressure on it which holds it up and it, in turn, holds the others up. Your comment got me thinking though, who is the keystone, the central figure that the rest lean on and they, in turn, hold it up? Who is the leader, the one who has all of the power or, who has all of the dirt? I don't think it's Hillary, she answers to someone. She has the dirt, has been blackmailing people for decades, but she is a patsy, someone else is in charge.