RE: Q post 'privilege from arreest'…footnote 1 is Long vs. Ansell
https://constitution.congress.gov/browse/essay/artI_S6_C1_1_2/#essay-3
The Flynn case protected them from getting arrested or served in any other cases that were in the pipeline against them (Project Cassandra comes to mind)
http://cdn.loc.gov/service/ll/usrep/usrep293/usrep293076/usrep293076.pdf