Missouri legislators have already started introducing bills for 2020. Representative Dan Stacy (R-Blue Springs) has introduced HB 1258. It changes Missouri primaries from open to closed. He introduced the same bill in 2019, HB 26, and it passed the House, but not the Senate. Thanks to Ken Bush for this news.
It should be up to each party to decide for itself if it wants a closed or open primary, provided that any party that opts for a closed primary must pay for it.
How many SECRET BALLOT States ???
How many NOOO SECRET BALLOT [aka PURGE LIST] States ???
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NOOOOO primaries — NOOOOO PURGE LIST States.
PR and AppV and TOTSOP
Also the matter of PRIVACY —
https://en.wikipedia.org/wiki/NAACP_v._Alabama
1958 — one of the cases setting up direct politics cases in 1960s
Also
https://en.wikipedia.org/wiki/McIntyre_v._Ohio_Elections_Commission
1995
Parties are both public [Electors faction/group] and private.