Absent of anything else going on, this memo would seem innocuous. However, when you consider that at least 20 FBI whistleblowers from the FBI have approached both the house and senate in the past several weeks, this memo takes on a new meaning.
According to the memo sent internally by AG Merrick Garland, he is reminding everyone in the DOJ/FBI about the restrictions against talking to congress. [SOURCE]

The internal citations take you to Justice Manual, Section 1, Title 800: “Congressional and White House Relations” [LINK]
1-8.200 “Except as provided in this chapter, no Department employee may communicate with Senators, Representatives, congressional committees, or congressional staff without advance coordination, consultation, and approval by the Office of Legislative Affairs (OLA). All congressional inquiries and correspondence from Members, committees, and staff should be immediately directed to OLA upon receipt.” [LINK]
Make of the timing what you will; however, if you have followed the political corruption within Main Justice and the FBI, the intent of the memo seems pretty clear. A warning to those who might consider trying to escape the clutches of a comprehensively corrupt institution. Or as Senator Chuck Grassley recently stated:

That extra $200/month equates to $2,400 per year.
According to the Washington Times, and further confirmed by John Solomon via contact with Chuck Grassley, the lead FBI Washington Field Office Special Agent in Charge, Tim Thibault, was removed from his position and reportedly escorted out of FBI headquarters on Friday; although his employment status is unknown.
A