In plain English
FAR 52.236-19, Organization and Direction of the Work, is a contract clause prescribed at FAR 36.519, most recently dated Apr 1984. The complete official text is reproduced below, verbatim, from GSA's published FAR source files.
Its text contains no sentence requiring insertion into subcontracts; see the flowdown section below for what that does and does not mean.
Does it flow down to subcontracts?
No flowdown mandate found in the clause text
We scanned the full clause text and found no sentence directing the contractor to insert this clause into subcontracts. That is a statement about the text, not legal advice: a prime contractor may still flow terms down contractually, an agency supplement (DFARS, VAAR, …) may add requirements, and clauses listed below (if any) may order this clause into subcontracts from the outside.
Where it's prescribed
As prescribed in 36.519 , insert the following clause in solicitations and contracts when a cost-reimbursement construction contract is contemplated:
Prescribing reference: FAR 36.519.
The official text, verbatim
As prescribed in 36.519 , insert the following clause in solicitations and contracts when a cost-reimbursement construction contract is contemplated:
Organization and Direction of the Work (Apr 1984)
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(a) When this contract is executed, the Contractor shall submit to the Contracting Officer a chart showing the general executive and administrative organization, the personnel to be employed in connection with the work under this contract, and their respective duties. The Contractor shall keep the data furnished current by supplementing it as additional information becomes available.
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(b) Work performance under this contract shall be under the full-time resident direction of (1) the Contractor, if the Contractor is an individual; (2) one or more principal partners, if the Contractor is a partnership; or (3) one or more senior officers, if Contractor is a corporation, association, or similar legal entity. However, if the Contracting Officer approves, the Contractor may be represented in the direction of the work by a specific person or persons holding positions other than those identified in this paragraph.
(End of clause)