And as usual the OP is seeking to contrive a controversy where none exists:
“The subpoenas were issued by pro bono attorneys helping the city prepare for the trial regarding the petition to repeal the new Houston Equal Rights Ordinance (HERO) in January. Neither the mayor nor City Attorney David Feldman were aware the subpoenas had been issued.”
Read more at
snopes.com City of Houston Subpoenas Pastors Sermons
Moreover, the issuing of the subpoenas is perfectly legal and appropriate, at issue is whether the scope of the information sought by the subpoenas is too broad.
Last, there is no evidence that the city's efforts are 'punitive' against those opposed to the equal rights ordinance.