Conversation so far:
What is the Second Select Committee in relation to Charles Bradlaugh?
The Select Committee began deliberating when it considered a paper put in by Sir Thomas Erskine May found several precedents for Members disabled to sit for refusing to take Oath
What was Charles Bradlaugh involvement in the Second Select Committee?
Erskine May and Bradlaugh himself were questioned by the Committee.

Question: What were they questioned about?
Self-contained rewrite: What were Erskine May and Charles Bradlaugh questioned about?