Freedom of Association/History/Country sources/Austria

Freedom of Association

What is the oldest written source in this country that mentions this right?

Austria

According to a report on human rights practices from the US State Department, "The constitution and law provide for the freedoms of peaceful assembly and association, and the government generally respected these rights." Austria ratified the ILO "Freedom of Association and Protection of the Right to Organise Convention" in 1950.

https://www.state.gov/reports/2021-country-reports-on-human-rights-practices/austria/

https://www.ilo.org/dyn/normlex/en/f?p=NORMLEXPUB:11300:0::NO::P11300_INSTRUMENT_ID:312232