In the second petition, the petitioners are calling on Parliament to conduct a thorough internal investigation including an extended forensic audit going back to the 1980s on the illegal, immoral and corrupt political practices and injustices which are being committed by some Nakoda Stony tribal leaders on the reserve population, especially those who have dominated since the 1960s.
The Nakoda Stony tribal leaders are not calling for an investigation.
It's definitely correct because it's the petitioners calling for an investigation against the tribal leaders, not the tribal leaders calling for an investigation. It's difficult because it uses many similar words from the text, but rearranged for a different meaning.
( z1 call :polarity - :ARG0 ( z2 person :ARG0-of ( z3 lead :ARG1 ( z4 tribe :name ( z5 name :op "Nakoda" :op "Stony" ) ) ) ) :ARG1 ( z6 investigate ) )