\documentclass{article}
\def\squeeze{\topsep=0pt\partopsep=0pt\itemsep=0pt\parsep=0pt\parskip=0pt}
\begin{document}
\begin{enumerate}
\itemindent 1.0truein
\item one
\item two
\item three
\item four
\end{enumerate}
\begin{itemize}
\itemindent 0.0truein
\squeeze
\item ONE
\item TWO
\item THREE
\end{itemize}
\end{document}