Seroney got in trouble in September 1969 when he presented the controversial "Nandi Hills Declaration", a document authored by his friend Joseph K. Mitei from Koilot, Ol'Lessos of Nandi District. Mitei was the Organizing Secretary of the ruling party KANU, Nandi branch when he wrote the document on 27 July 1969. The document challenged the Kenyatta administration's sale/settlement of Nandi land to non-Kalenjin settlers at the expense of former owners of that land while the other half was a protest against police brutality and the unfair judicial system in Nandi.
