This is the 13297th most frequent Russian word.
мошеннических
"Fraudulent."
Here, 'мошеннических' describes the noun 'продавцов,' meaning the sellers were engaging in fraud.
Они подали жалобу на мошеннических продавцов.
They filed a complaint against fraudulent sellers.
In this case, 'мошеннических' modifies 'схемах,' implying that the schemes are fraudulent.
Мы узнали о мошеннических схемах в компании.
We learned about fraudulent schemes in the company.
Here, 'мошеннических' refers to 'действий,' which indicates actions of a fraudulent nature.